Patent US2860977A successfully refreshed from Google Patents.
US2860977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic foam processing
Assignee: Eastman Kodak Co
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Filing: 1953-08-26
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Granted: 1958-11-18
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Expires: 1973-08-26
Abstract
No abstract record available.
Inventors
- 👤 Leonard W Tregillus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:52
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/04; G03C; G03C5/00; G03C5/26; G03C5/261; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE METHOD OF FORMING A VISIBLE IMAGE IN AN EXPOSED GELATINO-SILVER HALIDE EMULSION LAYER, WHICH COMPRISES SPREDING ON SAID EXPOSED LAYER A FOAM CONSISTING OF A CONCENTRATED DISPERSION OF GAS BUBBLES IN A LIQUID THE VOLUME SAID FOAM CONTAINING AN AQUEOUS SOLUTION FOAM VOLUME, SAID FOAM CONTAINING AN AQUEOUS SOLUTION OF AN ANIONIC SURFACE-ACTIVE AGENT AND AT LEAST HYDROQUINONE AS A DEVELOPING AGENG, ALLOWING SAID FOAM TO REMAIN IN CONTACT WITH SAID LAYER FOR ABOUT 5 SECONDS, REMOVING THE EXCESS FOAM FROM SAID LAYER, SPREDING ON SAID LAYER A STABILIZING FOAM OF THIQUREA AND A SURFACE-ACTIVE AGENT WHICH CREATES A STABLE PHYSICAL FOAM FOR AN APPRECIABLE PERIOD OF TIME, ALLOWING SAID STABLILZING FOAM TO REMAIN IN CONTACT WITH SAID LAYER FOR ABOUT 10 SECONDS, AND THEN REMOVING THE EXCESS STABILIZING FOAM FROM SAID LAYER.
Claim 2
Independent Claim
134 words
THE METHOD OF FORMING A VISIBLE IMAGE IN AN EXPOSED GELATINO-SILVER HALIDE EMULSION LAYER, WHICH COMPRISES SPREDING ON SAID EXPOSED LAYER A FOAM CONSISTING OF A CONCENTRATED DISPERSION OF GAS BUBBLES IN A LIQUID THE VOLUME SAID FOAM CONTAINING AN AQUEOUS SOLUTION FOAM VOLUME, SAID FOAM CONTAINING AN AQUEOUS SOLUTION OF AN ANIONIC SURFACE-ACTIVE AGENT AND AT LEAST HYDROQUINONE AS A DEVELOPING AGENG, ALLOWING SAID FOAM TO REMAIN IN CONTACT WITH SAID LAYER FOR ABOUT 5 SECONDS, REMOVING THE EXCESS FOAM FROM SAID LAYER, SPREDING ON SAID LAYER A STABILIZING FOAM OF THIQUREA AND A SURFACE-ACTIVE AGENT WHICH CREATES A STABLE PHYSICAL FOAM FOR AN APPRECIABLE PERIOD OF TIME, ALLOWING SAID STABLILZING FOAM TO REMAIN IN CONTACT WITH SAID LAYER FOR ABOUT 10 SECONDS, AND THEN REMOVING THE EXCESS STABILIZING FOAM FROM SAID LAYER.
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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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |