US3762944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrothermographic duplicating sheet and process
Assignee: Dennison Manufacturing Co
•
Filing: 1971-11-12
•
Granted: 1973-10-02
•
Expires: 1991-11-12
Abstract
Abstract Electrothermographic reproduction sheet and process in which the latent image is both electrostatic and tacky to achieve more uniform and higher image densities, lower background densities and better resolution.
Inventors
- 👤 D Sloan
- 👤 S Amberker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:03
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/398; G; G03; G03G; G03G5/00; G03G5/02; G03G5/028; A; A63; A63F; A63F9/00; A63F9/06; A63F9/12; A63F9/1204
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
15 words
A process according to claim 1, said layer being supported on an electrically conductive support.
Claim 2
Dependent Claim
59 words
A method according to claim 1, said exposure step preceding said charging step, said exposure step forming a latent tacky image, said exposed layer being subjected to said charging step to form said electrostatic image while said latent tacky image is still tacky, said charging step being followed by toner developing said latent image while it is still tacky.
Claim 3
Dependent Claim
20 words
A method according to claim 3, said exposure being a direct exposure by passing said radiant energy through said master.
Claim 4
Dependent Claim
16 words
A process according to claim 1, also including the step of toner developing said latent image.
Claim 5
Dependent Claim
12 words
A process according to claim 5, including fixing said toner developed image.
Claim 6
Dependent Claim
58 words
A process according to claim 1, said layer comprising a resin and an organic heat activatable tackifying agent which is activated by said radiant energy to convert said resin-tackifying agent system form a normally non-tacky state to a soft and tacky state, said resin-tackifying agent system being also sensitive to said energy to change the electrical resistance thereof.
Claim 7
Dependent Claim
22 words
A process according to claim 7, said tackifying agent being a plasticizer for said resin and said resin being a thermoplastic resin.
Claim 8
Dependent Claim
26 words
A process according to claim 7, said tackifying agent being selected from the group consisting of a phosphate ester, a phthalate ester, a sulfonamide and terphenyl.
Claim 9
Dependent Claim
31 words
A process according to claim 7, said tackifying agent being normally non-tacky but being activated by electrothermographic heat to become tacky and thereby render said resin-tackifying agent system soft and tacky.
Claim 10
Dependent Claim
21 words
A process according to claim 7, said resin being electrostatically chargeable and sensitive to electrothermographic heat to change its electrical resistance.
Claim 11
Dependent Claim
23 words
A process according to claim 7, said tackifying agent being electrostatically chargeable and being responsive to heat to change the electrical resistance thereof.
Claim 12
Dependent Claim
82 words
A process according to claim 7, said resin being substantially non-tacky when exposed to said energy, the ratio of tackifying agent to resin being selected so that when the non-charged layer is in contact with said master during said exposure step, the tackiness of said layer developed by said exposure is insufficient to cause the layer to stick to the master but is sufficient to cause substantial amounts of non-charged toner particles to adhere thereto when said toner particles are applied thereto.
Claim 13
Dependent Claim
17 words
A process according to claim 7, said tackifying agent being a heat activatable, delayed tack tackifying agent.
Claim 14
Dependent Claim
19 words
A process according to claim 7, the ratio of said tackifying agent to said resin being at least 1.
Claim 15
Dependent Claim
12 words
A process according to claim 15, said ratio being at least 2.
Claim 16
Dependent Claim
17 words
A process according to claim 7, said layer forming a coating adhered to a conductive support sheet.
Claim 17
Dependent Claim
25 words
A process according to claim 17, including the step of applying said resin and tackifying agent coating to said support from an aqueous dispersion thereof.
Claim 18
Dependent Claim
14 words
A process according to claim 17, said coating also including a coating levelling agent.
Claim 19
Dependent Claim
12 words
A process according to claim 19, said levelling agent being a protein.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |