US3652276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic photoconductor systems utilizing reversible redox materials to improve latent image life
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1969-07-02
•
Granted: 1972-03-28
•
Expires: 1989-07-02
Abstract
Abstract A copy medium comprising a support, a photoconductor, and a reversible oxidizing agent is exposed to produce a latent image of improved stability and then, after a time period of at least 30 seconds, contacted with image-forming materials to produce an irreversible image. Optionally, the reversible oxidizing agent may be applied to the copy medium immediately after exposure. An acidified copy medium is especially preferred since the stability of the latent image is much improved.
Inventors
- 👤 Richard F Bartlett
- 👤 Itek Corp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
14 words
An improvement of claim 1 wherein said reversible oxidizing agent comprises an arylamine dye.
Claim 2
Dependent Claim
14 words
An improvement of claim 2 wherein said arylamine dye further comprises a thiazine dye.
Claim 3
Dependent Claim
18 words
An improvement of claim 2 wherein said reversibly activatable photoconductor comprises a metal oxide or a metal sulfide.
Claim 4
Dependent Claim
16 words
An improvement of claim 3 wherein said reversibly activatable photoconductor comprises titanium dioxide or zinc oxide.
Claim 5
Dependent Claim
24 words
An improvement of claim 5 wherein said reversibly activatable photoconductor comprises titanium dioxide having an average particle size of less than about 250 millimicrons.
Claim 6
Dependent Claim
16 words
An improvement of claim 6 wherein said titanium dioxide is dispersed in a solvent permeable binder.
Claim 7
Dependent Claim
16 words
An improvement of claim 7 wherein the metal ions in said image-forming materials comprise silver ions.
Claim 8
Dependent Claim
15 words
An improvement of claim 8 wherein said reversible oxidizing agent comprises Thionine or Toluidine Blue.
Claim 9
Dependent Claim
20 words
An improvement of claim 9 wherein said reversible oxidizing agent is incorporated into said photoconductive medium prior to exposure thereof.
Claim 10
Dependent Claim
30 words
An improvement of claim 10 wherein said photoconductive medium additionally has incorporated therein an acidic material which maintains the pH of said photoconductive medium at a pH below about 3.
Claim 11
Dependent Claim
71 words
A process for recording an image pattern of actinic radiation comprising: a. contactinG, in an environment having a pH below about 5, a photoconductive medium containing a photoconductor which is reversibly activatable by actinic radiation with a reversible oxidizing agent having a redox potential (EO) of from about 0.1 to about 0.7; and, b. exposing said photoconductive medium to an image pattern of actinic radiation to thereby reversibly activate said photoconductor.
Claim 12
Dependent Claim
46 words
A process of claim 12 including the additional step of subsequently developing a visible image in said exposed medium by contacting exposed portions with image-forming materials containing metal ions having at least the oxidizing power of cupric ions and a reducing agent for said metal ions.
Claim 13
Dependent Claim
14 words
A process of claim 13 wherein said reversible oxidizing agent comprises an arylamine dye.
Claim 14
Dependent Claim
14 words
An improvement of claim 14 wherein said arylamine dye further comprises a thiazine dye.
Claim 15
Dependent Claim
36 words
An improvement of claim 15 wherein said photoconductive medium comprises titanium dioxide or zinc oxide dispersed in a solvent permeable binder and said medium also contains an acidic material to maintain its pH below about 3.
Claim 16
Dependent Claim
16 words
A process of claim 16 wherein the metal ions in said image-forming materials comprise silver ions.
Claim 17
Dependent Claim
15 words
A process of claim 17 wherein said reversible oxidizing agent comprises Thionine or Toluidine Blue.
Claim 18
Dependent Claim
57 words
A copy medium comprising: a. a support; and, b. a photosensitive photoconductive coating on said support, said photoconductive coating containing a photoconductor which is reversibly activatable by actinic radiation and a reversible oxidizing agent having a redox potential (EO) of from about 0.1 to about 0.7, said photoconductive coating also having a pH of below about 5.
Claim 19
Dependent Claim
15 words
A copy medium of claim 19 wherein said reversible oxidizing agent comprises an arylamine dye.
Claim 20
Dependent Claim
15 words
A copy medium of claim 20 wherein said reversible oxidizing agent comprises a thiazine dye.
Claim 21
Dependent Claim
43 words
A copy medium of claim 21 wherein said photoconductive coating comprises titanium dioxide or zinc oxide dispersed in a solvent permeable binder and also contains a sufficient amount of an acidic material to maintain the pH of said photoconductive coating below about 3.
Claim 22
Dependent Claim
11 words
A copy medium of claim 22 wherein said support is conductive.
Claim 23
Dependent Claim
12 words
A copy medium of claim 23 wherein said conductive support comprises aluminum.
Claim 24
Dependent Claim
18 words
A copy medium of claim 24 wherein said photoconductive coating is less than about 0.001 cm in thickness.
Claim 25
Dependent Claim
16 words
A copy medium of claim 25 wherein said reversible oxidizing agent comprises Thionine or Toluidine Blue.
References Cited (Backward Citations)
US3052540A
Cited
US3180730A
Cited
US3152903A
Cited
US3198633A
Cited
US3147119A
Cited
US3404980A
Cited
US3271143A
Cited
US3414410A
Cited
US3245786A
Cited
US3197307A
Cited
US3372029A
Cited
US3380823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |