US3072480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic diffusion transfer process
Assignee: Eastman Kodak Co
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Filing: 1959-04-10
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Granted: 1963-01-08
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Expires: 1979-04-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas I Abbott
- 👤 Edward C Yackel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:07
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
A PHOTOGRAPHIC DIFFUSION TRANSFER PROCESS FOR PRODUCING NEGATIVE IMAGES COMPRISING (A) EXPOSING A DEVELOPING-OUT TYPE SILVER HALIDE EMULSION LAYER TO A SUBJECT, (B) IMBIBING IN SAID EXPOSED EMULSION LAYER AN AQUEOUS ALKALINE SOLUTION WHILE THE SILVER HALIDE OF SAID EMULSION LAYER IS IN CONTACT WITH A SILVER HALIDE DEVELOPING AGENT, BUT IN THE SUBSTANTIAL ABSENCE OF SILVER HALIDE SOLVENT, THEREBY FORMING IN SAID SILVER HALIDE EMULSION LAYER A VISIBLE IMAGE COMPRISING NEGATIVE SILVER AND HALIDE ION, (C) DIFFUSING SAID HALIDE ION FROM THE NEGATIVE IMAGE AREAS ONLY OF SAID EMULSION LAYER TO A CONTIGUOUS, LIGHT-INSENSITIVE, ABSORBENT LAYER LEAVING UNEXPOSED, UNDEVELOPED SILVER HALIDE IN SAID EMULSION LAYER, AND (D) CONVENTING THE RESULTANT HALIDE ION LATENT IMAGE TO A VISIBLE IMAGE WITH SOLUBLE SILVER SALT.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |