US7255508B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing system and ink pen having time-dependent characteristics
Assignee: Individual
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Filing: 2005-12-07
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Granted: 2007-08-14
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Expires: 2025-12-07
Abstract
Abstract A writing system for producing a writing having time-dependent characteristics includes: a pen including: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid includes a first chemical; and a writing surface including a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, and wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface.
Inventors
- 👤 Andrew F. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:56
CPC Classifications
B; B43; B43K; B43K1/00; B43K1/08; B43K1/12; B43K27/00; B43K27/08; B43K7/00; B43K7/02; B43K8/00; B43K8/02; B43K8/024; B43K8/03; B43K8/04; C; C09; C09D; C09D11/00; C09D11/16; C09D11/18
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
A writing system for producing a writing having time-dependent characteristics, comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface, and wherein the fluid comprises a third chemical and the writing surface comprises a fourth chemical that is chemically reactive with the third chemical such that their chemical reaction causes them to solidify into a solid product.
Claim 2
Dependent Claim
133 words
A writing system for producing a writing having time-dependent characteristics, comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface, and wherein the fluid comprises a third chemical and the writing surface comprises a fourth chemical that is chemically reactive with the third chemical such that their chemical reaction causes them to solidify into a solid product.
Claim 3
Dependent Claim
24 words
The writing system as claimed in claim 1 , wherein at least one of the fluid and the writing surface comprises a heat-activated indicator.
Claim 4
Dependent Claim
88 words
The writing system as claimed in claim 1 , wherein the third and fourth chemicals solidify into a solid product at a rate such that a viscosity of a mixture of the third and fourth chemicals at 25 degrees Celsius is greater than 10,000 centipoise at any time after seven days after a time of mixing of the third and fourth chemicals, and wherein the viscosity is less than 10,000 centipoise at any time before one day after the time of mixing of the third and fourth chemicals.
Claim 5
Dependent Claim
58 words
The writing system as claimed in claim 1 , wherein the fluid further comprises a first dye, wherein the writing surface further comprises a second dye, and wherein a color of the fluid as applied to the writing surface is indicative of a relative concentration of the first chemical in a mixture of the first and second chemicals.
Claim 6
Dependent Claim
37 words
The writing system as claimed in claim 1 , wherein at least one of the fluid and the writing surface further comprises a first chemical identifier, the first chemical identifier comprising at least a first rare-earth element.
Claim 7
Independent Claim
141 words
A method of dating a writing, comprising: providing a writing created by a writing system for producing a writing having time-dependent characteristics, the writing system comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface; measuring an extent of chemical reaction between the first and second chemicals; and determining an approximate time of creation of the writing based at least in part on the measuring.
Claim 8
Independent Claim
141 words
A method of dating a writing, comprising: providing a writing created by a writing system for producing a writing having time-dependent characteristics, the writing system comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface; measuring an extent of chemical reaction between the first and second chemicals; and determining an approximate time of creation of the writing based at least in part on the measuring.
Claim 9
Dependent Claim
23 words
The method as claimed in claim 6 , wherein at least one of the fluid and the writing surface comprises a heat-activated indicator.
Claim 10
Dependent Claim
44 words
The method as claimed in claim 6 , wherein the fluid comprises a third chemical and the writing surface comprises a fourth chemical that is chemically reactive with the third chemical such that their chemical reaction causes them to solidify into a solid product.
Claim 11
Dependent Claim
87 words
The method as claimed in claim 8 , wherein the third and fourth chemicals solidify into a solid product at a rate such that a viscosity of a mixture of the third and fourth chemicals at 25 degrees Celsius is greater than 10,000 centipoise at any time after seven days after a time of mixing of the third and fourth chemicals, and wherein the viscosity is less than 10,000 centipoise at any time before one day after the time of mixing of the third and fourth chemicals.
Claim 12
Dependent Claim
57 words
The method as claimed in claim 6 , wherein the fluid further comprises a first dye, wherein the writing surface further comprises a second dye, and wherein a color of the fluid as applied to the writing surface is indicative of a relative concentration of the first chemical in a mixture of the first and second chemicals.
Claim 13
Dependent Claim
36 words
The method as claimed in claim 6 , wherein at least one of the fluid and the writing surface further comprises a first chemical identifier, the first chemical identifier comprising at least a first rare-earth element.
Claim 14
Independent Claim
141 words
A method of creating a time-stamped writing, comprising: providing a writing system for producing a writing having time-dependent characteristics, the writing system comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface; and creating a writing on the writing surface using the pen, wherein an approximate time of the creating is ascertainable by determining an extent of chemical reaction between the first and second chemicals.
Claim 15
Independent Claim
141 words
A method of creating a time-stamped writing, comprising: providing a writing system for producing a writing having time-dependent characteristics, the writing system comprising: a pen comprising: a reservoir containing a fluid; and a writing tip configured to dispense the fluid to a writing surface, wherein the fluid comprises a first chemical; and a writing surface comprising a second chemical chemically reactive with the first chemical, wherein the chemical reaction between the first and second chemicals has a known time dependence, wherein an extent of chemical reaction between the first chemical and the second chemical is indicative of a time of dispensing of the fluid to the writing surface; and creating a writing on the writing surface using the pen, wherein an approximate time of the creating is ascertainable by determining an extent of chemical reaction between the first and second chemicals.
Claim 16
Dependent Claim
23 words
The method as claimed in claim 12 , wherein at least one of the fluid and the writing surface comprises a heat-activated indicator.
Claim 17
Dependent Claim
44 words
The method as claimed in claim 12 , wherein the fluid comprises a third chemical and the writing surface comprises a fourth chemical that is chemically reactive with the third chemical such that their chemical reaction causes them to solidify into a solid product.
Claim 18
Dependent Claim
87 words
The method as claimed in claim 14 , wherein the third and fourth chemicals solidify into a solid product at a rate such that a viscosity of a mixture of the third and fourth chemicals at 25 degrees Celsius is greater than 10,000 centipoise at any time after seven days after a time of mixing of the third and fourth chemicals, and wherein the viscosity is less than 10,000 centipoise at any time before one day after the time of mixing of the third and fourth chemicals.
Claim 19
Dependent Claim
57 words
The method as claimed in claim 12 , wherein the fluid further comprises a first dye, wherein the writing surface further comprises a second dye, and wherein a color of the fluid as applied to the writing surface is indicative of a relative concentration of the first chemical in a mixture of the first and second chemicals.
Claim 20
Dependent Claim
36 words
The method as claimed in claim 12 , wherein at least one of the fluid and the writing surface further comprises a first chemical identifier, the first chemical identifier comprising at least a first rare-earth element.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2010-08-13 | 2011-02-12 | 2011-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-08-13 | 2015-02-12 | 2015-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-08-13 | 2019-02-12 | 2019-08-14 | $7700.00 | Window Closed / Lapsed |