US3765890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic hydrogen peroxide addition compounds for vesicular image formation processes
Assignee: Agfa Gevaert AG
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Filing: 1971-11-15
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Granted: 1973-10-16
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Expires: 1991-11-15
Abstract
Abstract Photographic images are produced by imagewise decomposition of addition compounds of hydrogen peroxide with organic compounds, the image being made visible, either physically by developing the gas bubbles formed during decomposition, or chemically by using the oxygen formed during decomposition for a color-forming reaction.
Inventors
- 👤 E Weyde
- 👤 R Matejec
- 👤 M Scheibitz
- 👤 R Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:33
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/60; G03C1/00; G03C1/64; G03C5/26; G03C5/40; Y; Y10; Y10S; Y10S430/00; Y10S430/144
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
The process of claim 1, wherein an addition compound with hydrogen peroxide has a decomposing temperature between 60* and 150*C.
Claim 2
Dependent Claim
31 words
The process of claim 2, wherein the hydrogen peroxide forming compound is an addition compound of hydrogen peroxide with an aliphatic acid amide, aliphatic polyhydric alcohol, aliphatic amine or acyl-substituted hydrazine.
Claim 3
Dependent Claim
20 words
The process of claim 3, wherein the hydrogen peroxide forming compound is an addition product of hydrogen peroxide with urea.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |