US2855299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processes
Assignee: Polaroid Corp
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Filing: 1955-06-07
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Granted: 1958-10-07
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Expires: 1975-06-07
Abstract
No abstract record available.
Inventors
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:57
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A PROCESS OF FORMING A PHOTOGRAPHIC IMAGE IN COLOR, THE STEPS WHICH COMPRISE DEVELOPING A LATENT IMAGE CONTAINED IN AN EXPOSED SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION OF 1-HENYL-3PYRAZOLIDONE TO PROVIDE IN SAID EMULSION A PREDETERMINED DISTRIBUTION OF UNOXIDIZED 1-PHENYL-3-PYRAZOLIDONE, TRANSFERRING AT LEAST PART OF SAID DISTRIBUTION OF UNOXIDIZED 1PHENYL-3-PYRAZOLIDONE BY IMHIBITION FROM SAID EMULSION TO AN IMAGE-RECEIVING LAYER CONSISTING ESSENTIALLY OF POLYVINYL ALCOHOL IN SUPERPOSED RELATIONSHIP WITH SAID EMULSION, AND OXIDIZING AT LEAST PART OF SAID TRANSFERRED UNOXIDIZED 1-PHENYL-3-PYRAZOLIDONE TO IMPART TO SAID IMAGERECEIVING LAYER A REVERSED, POSITIVE COLOR IMAGE OF THE DEVELOPED IMAGE.
Claim 2
Dependent Claim
98 words
IN A PROCESS OF FORMING A PHOTOGRAPHIC IMAGE IN COLOR, THE STEPS WHICH COMPRISE DEVELOPING A LATENT IMAGE CONTAINED IN AN EXPOSED SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION OF 1-HENYL-3PYRAZOLIDONE TO PROVIDE IN SAID EMULSION A PREDETERMINED DISTRIBUTION OF UNOXIDIZED 1-PHENYL-3-PYRAZOLIDONE, TRANSFERRING AT LEAST PART OF SAID DISTRIBUTION OF UNOXIDIZED 1PHENYL-3-PYRAZOLIDONE BY IMHIBITION FROM SAID EMULSION TO AN IMAGE-RECEIVING LAYER CONSISTING ESSENTIALLY OF POLYVINYL ALCOHOL IN SUPERPOSED RELATIONSHIP WITH SAID EMULSION, AND OXIDIZING AT LEAST PART OF SAID TRANSFERRED UNOXIDIZED 1-PHENYL-3-PYRAZOLIDONE TO IMPART TO SAID IMAGERECEIVING LAYER A REVERSED, POSITIVE COLOR IMAGE OF THE DEVELOPED IMAGE.
References Cited (Backward Citations)
US2698244A
Cited
US2751300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |