US3228769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive copy-sheet comprising zinc oxide and a diazonium compound and method of copying
Assignee: 3M Co
•
Filing: 1961-05-04
•
Granted: 1966-01-11
•
Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 Wesley R Workman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF PRODUCING GRAPHIC COPY COMPRISING: EXPOSING TO A LIGHT-IMAGE A SENSTIZED COPY-SHEET SURFACE COMPRISING A LIGHT-SENSITIVE DIAZONIUM COMPOUND, AN AZO DYE COUPLER, AND ZINC OXIDE, THE ZINC OXIDE BEING IN A SUBSTRATUM OF SAID SENSITIZED SURFACE AND DISPERSED IN A WATERRESISTANT FIRST BINDER MATERIAL AND IN AN AMOUNT BY WEIGHT OF FROM ABOUT ONE-HALF TO ABOUT TWO TIMES THE WEIGHT OF SAID BINDER, AND AT LEAST ONE OF THE SAID COMPOUND AND SAID COUPLER BEING IN A SURFACE STATUM OF SAID SENSITIZED SURFACE ADJACENT SAID SUB-STRATUM AND DISPERSED IN A SECOND AND DIFFERENT BINDER MATERIAL, TO DESENSITIZE SAID COMPOUND AT THE LIGHT-STRUCK AREA; AND HEATING SAID SURFACE TO OBTAIN A VISIBLY DISTINCT REACTION PRODUCT AT THE UNLIGHTED AREA.
Claim 2
Independent Claim
120 words
THE METHOD OF PRODUCING GRAPHIC COPY COMPRISING: EXPOSING TO A LIGHT-IMAGE A SENSTIZED COPY-SHEET SURFACE COMPRISING A LIGHT-SENSITIVE DIAZONIUM COMPOUND, AN AZO DYE COUPLER, AND ZINC OXIDE, THE ZINC OXIDE BEING IN A SUBSTRATUM OF SAID SENSITIZED SURFACE AND DISPERSED IN A WATERRESISTANT FIRST BINDER MATERIAL AND IN AN AMOUNT BY WEIGHT OF FROM ABOUT ONE-HALF TO ABOUT TWO TIMES THE WEIGHT OF SAID BINDER, AND AT LEAST ONE OF THE SAID COMPOUND AND SAID COUPLER BEING IN A SURFACE STATUM OF SAID SENSITIZED SURFACE ADJACENT SAID SUB-STRATUM AND DISPERSED IN A SECOND AND DIFFERENT BINDER MATERIAL, TO DESENSITIZE SAID COMPOUND AT THE LIGHT-STRUCK AREA; AND HEATING SAID SURFACE TO OBTAIN A VISIBLY DISTINCT REACTION PRODUCT AT THE UNLIGHTED AREA.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |