US2751300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic solvent transfer reproduction process
Assignee: Eastman Kodak Co
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Filing: 1954-07-15
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Granted: 1956-06-19
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Expires: 1974-07-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas H James
- 👤 Leonard W Tregillus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING A SUPPORTED SILVER HALIDE EMULSION LAYER TO A SUBJECT, DEVELOPING THE EXPOSED EMULSION LAYER IN THE PRESENCE OF A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT AND AN ASCORBIC ACID DEVELOPING AGENT BY MEANS OF AN ALKALINE DEVELOPING SOLUTION CONTAINING A SILVER HALIDE SOLVENT WHILE SAID EMULSION LAYER IS IN INTIMATE CONTACT FOR A PORTION OF THE DEVELOPMENT PERIOD WITH THE SURFACE OF A RECEIVING LAYER CONTAINING A SILVER PRECIPITANT, ALLOWING DEVELOPMENT TO PROCEED UNTIL A SILVER
Claim 2
Dependent Claim
82 words
A PHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES EXPOSING A SUPPORTED SILVER HALIDE EMULSION LAYER TO A SUBJECT, DEVELOPING THE EXPOSED EMULSION LAYER IN THE PRESENCE OF A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT AND AN ASCORBIC ACID DEVELOPING AGENT BY MEANS OF AN ALKALINE DEVELOPING SOLUTION CONTAINING A SILVER HALIDE SOLVENT WHILE SAID EMULSION LAYER IS IN INTIMATE CONTACT FOR A PORTION OF THE DEVELOPMENT PERIOD WITH THE SURFACE OF A RECEIVING LAYER CONTAINING A SILVER PRECIPITANT, ALLOWING DEVELOPMENT TO PROCEED UNTIL A SILVER
References Cited (Backward Citations)
US2688549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |