Patent US3547077A successfully refreshed from Google Patents.
Patent US2830900A successfully refreshed from Google Patents.
US2830900A
Expired / Lapsed
US
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Process of washing and protecting photographic silver images, and photographic products thereof
Assignee: Polaroid Corp
•
Filing: 1956-10-04
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Granted: 1958-04-15
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Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Elkan R Blout
- 👤 Howard C Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/08; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A PROCESS FOR WASHING AND PROTECTING A PHOTOGRAPHIC SILVER IMAGE, SWABBING SAID IMAGE WITH AN ABSORBENT APPLICATOR CHARGED WITH A COMPOSITION COMPRISING A SOLUTION PREPARED BY DISSOLVING A VINYLPRIDINE POLYMER IN A MIXTURE OF WATER, A WATER-MISCRIBLE, VOLATILE, ORGANIC SOLVENT FOR SAID POLYMER AND ACETIC ACID IN THE FOLLOWING PROPORTIONS: POLYMER G 10-25 WATER CC-- 50-70 ORGANIC SOLVENT CC-- 30-50 ACETIC ACID CC 0.2-5
Claim 2
Dependent Claim
65 words
IN A PROCESS FOR WASHING AND PROTECTING A PHOTOGRAPHIC SILVER IMAGE, SWABBING SAID IMAGE WITH AN ABSORBENT APPLICATOR CHARGED WITH A COMPOSITION COMPRISING A SOLUTION PREPARED BY DISSOLVING A VINYLPRIDINE POLYMER IN A MIXTURE OF WATER, A WATER-MISCRIBLE, VOLATILE, ORGANIC SOLVENT FOR SAID POLYMER AND ACETIC ACID IN THE FOLLOWING PROPORTIONS: POLYMER G 10-25 WATER CC-- 50-70 ORGANIC SOLVENT CC-- 30-50 ACETIC ACID CC 0.2-5
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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) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |