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US4183990A
Expired / Lapsed
US
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Step tablet
Assignee: Fujifilm Holdings Corp
•
Filing: 1977-11-21
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Granted: 1980-01-15
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Expires: 1997-11-21
Abstract
Abstract A step tablet in which density steps of a definite shape, each density step having a specific optical density, form a series of decreasing or increasing densities, in which any two density steps contiguous to each other are disposed with a boundary space of a specific shape between the density steps.
Inventors
- 👤 Toshio Uchida
- 👤 Yorimiti Yabuta
- 👤 Hiroshi Noguchi
- 👤 Eiichi Hasegawa
- 👤 Teppei Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:44
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
48 words
A step tablet with optical density steps of a definite shape, each step having a different specific optical density, disposed in a specific order, in which any two adjacent optical density steps have a boundary which is not transparent to actinic radiation and of a specific shape therebetween.
Claim 2
Dependent Claim
48 words
A step tablet with optical density steps of a definite shape, each step having a different specific optical density, disposed in a specific order, in which any two adjacent optical density steps have a boundary which is not transparent to actinic radiation and of a specific shape therebetween.
Claim 3
Dependent Claim
16 words
The tablet described in claim 1, wherein said boundary space is linear with a specific width.
Claim 4
Dependent Claim
21 words
The step tablet described in claim 1, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 5
Dependent Claim
18 words
The step tablet described in claim 1, wherein said optical density step has a circular or elliptical shape.
Claim 6
Dependent Claim
24 words
The step tablet described in claim 1, wherein at least one of said optical density step includes an indicator mark transparent to actinic radiation.
Claim 7
Dependent Claim
25 words
The step tablet described in claim 1, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 8
Dependent Claim
22 words
The step tablet described in claim 1, wherein said optical density steps are disposed in a decrasing or increasing optical density order.
Claim 9
Dependent Claim
17 words
The step tablet described in claim 7, wherein said boundary space is linear with a specific width.
Claim 10
Dependent Claim
21 words
The step tablet described in claim 7, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 11
Dependent Claim
18 words
The step tablet described in claim 7, wherein said optical density step has a circular or elliptical shape.
Claim 12
Dependent Claim
24 words
The step tablet described in claim 7, wherein at least one of said optical density steps includes an indicator mark transparent to actinic radiation.
Claim 13
Dependent Claim
25 words
The step tablet described in claim 7, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 14
Dependent Claim
25 words
The step tablet described in claim 7, wherein the optical density of said boundary space corresponds to the maximum optical density of said step tablet.
Claim 15
Dependent Claim
25 words
The step tablet described in claim 13, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 16
Dependent Claim
15 words
The step tablet described in claim 1, wherein said optical density steps are disposed randomly.
Claim 17
Dependent Claim
17 words
The step tablet described in claim 15, wherein said boundary space is linear with a specific width.
Claim 18
Dependent Claim
21 words
The step tablet described in claim 15, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 19
Dependent Claim
18 words
The step tablet described in claim 15, wherein said optical density step has a circular or elliptical shape.
Claim 20
Dependent Claim
24 words
The step tablet described in claim 15, wherein at least one of said optical density steps includes an indicator mark transparent to actinic radiation.
Claim 21
Dependent Claim
25 words
The step tablet described in claim 15, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 22
Dependent Claim
25 words
The step tablet described in claim 15, wherein the optical density of said boundary space corresponds to the maximum optical density of said step tablet.
Claim 23
Dependent Claim
25 words
The step tablet described in claim 21, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 24
Dependent Claim
25 words
The step tablet described in claim 1, wherein the optical density of said boundary space corresponds to the maximum optical density of said step tablet.
Claim 25
Dependent Claim
25 words
The step tablet described in claim 23, wherein at least one of said optical density steps includes an indicator mark not transparent to actinic radiation.
Claim 26
Dependent Claim
72 words
A step tablet with optical density steps of a definite shape, each step having a different specific optical density, disposed in a specific order, in which any two adjacent optical density steps have a boundary space of a specific shape therebetween wherein said boundary space comprises a portion transparent to actinic radiation and a portion not transparent to actinic radiation and said two portions contact the same two adjacent optical density steps.
Claim 27
Dependent Claim
72 words
A step tablet with optical density steps of a definite shape, each step having a different specific optical density, disposed in a specific order, in which any two adjacent optical density steps have a boundary space of a specific shape therebetween wherein said boundary space comprises a portion transparent to actinic radiation and a portion not transparent to actinic radiation and said two portions contact the same two adjacent optical density steps.
Claim 28
Dependent Claim
17 words
The step tablet described in claim 25, wherein said boundary space is linear with a specific width.
Claim 29
Dependent Claim
21 words
The step tablet described in claim 25, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 30
Dependent Claim
18 words
The step tablet described in claim 25, wherein said optical density step has a circular or elliptical shape.
Claim 31
Dependent Claim
22 words
The step tablet described in claim 25, wherein said optical density steps are disposed in a decreasing or increasing optical density order.
Claim 32
Dependent Claim
17 words
The step tablet described in claim 29, wherein said boundary space is linear with a specific width.
Claim 33
Dependent Claim
21 words
The step tablet described in claim 29, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 34
Dependent Claim
18 words
The step tablet described in claim 29, wherein said optical density step has a circular or elliptical shape.
Claim 35
Dependent Claim
15 words
The step tablet described in claim 25, wherein said optical density steps are disposed randomly.
Claim 36
Dependent Claim
17 words
The step tablet described in claim 33, wherein said boundary space is linear with a specific width.
Claim 37
Dependent Claim
21 words
The step tablet described in claim 33, wherein the boundary space is disposed around and completely surrounds each optical density step.
Claim 38
Dependent Claim
18 words
The step tablet described in claim 33, wherein said optical density step has a circular or elliptical shape.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |