Patent US2878121A successfully refreshed from Google Patents.
US2878121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic elements and processes
Assignee: EIDP Inc
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Filing: 1954-11-15
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Granted: 1959-03-17
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Expires: 1974-11-15
Abstract
No abstract record available.
Inventors
- 👤 Gray Russell Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES INPEGNATING WITH A DEVELOPER SOLUTION AN EXPOSED SILVER HALIDE LAYER AND A CONTIGUOUS LIGHT-SENSITIVE LAYER OF FINELY DIVIDED INERT SOLID PARTICLES HAVING AN AVERAGE DIAMETER FROM 0.001 TO 10.0 MICRONS COATED WITH A SILANIC COMPOUND HAVING AT LEAST ONE SILICON-HYDROGEN BOND, SAID COMPOUND CONSTITUTING 0.1 TO 100% OF THE WEIGHT OF THE UNCOATED PARTICLES, MAINTAINING SAID LAYERS IN SURFACE CONTACT UNTIL THE IMAGES ARE DEVELOPED AND REMOVING THE ORIGINAL SILVER HALIDE 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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |