Patent US2909430A successfully refreshed from Google Patents.
US2909430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processes
Assignee: Polaroid Corp
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Filing: 1958-10-08
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Granted: 1959-10-20
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Expires: 1978-10-08
Abstract
No abstract record available.
Inventors
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:25
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; B; B65; B65H; B65H2701/00; B65H2701/50; B65H2701/51; B65H2701/515; B65H2701/5152; B65H2701/51522
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
IN A PROCESS OF FORMING PHOTOGRAPHIC IMAGES IN COLOR, THE STEPS WHICH COMPRISE DEVELOPING A LATENT IMAGE CONTAINED IN AN EXPOSED SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION OF A LEUCO COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
36 words
IN A PROCESS OF FORMING PHOTOGRAPHIC IMAGES IN COLOR, THE STEPS WHICH COMPRISE DEVELOPING A LATENT IMAGE CONTAINED IN AN EXPOSED SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION OF A LEUCO COMPOUND OF THE FORMULA:
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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |