US2698798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic process and product
Assignee: Polaroid Corp
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Filing: 1949-05-21
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Granted: 1955-01-04
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Expires: 1969-05-21
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN A PROCESS OF FORMING POSITIVE IMAGES IN COLOR FROM A NEGATIVE LATENT IMAGE IN A SILVER HALIDE EMULSION LAYER OF A PHOTOSENSITIVE ELEMENT WHEREIN SAID PHOTOSENSITIVE ELEMENT, IN ADDITION TO SILVER HALIDE, CONTAINS A SILVER HALIDE DEVELOPER HAVING AN OXIDATION PRODUCT REACTABLE WITH COUPLER MATERIAL TO FORM IMAGE DYE AND WHEREIN SAID PHOTOSENSITIVE ELEMENT ALSO CONTAINS COUPLER MATERIAL REACTABLE WITH OXIDIZED DEVELOPER TO PROVIDE SAID DYE, THE STEPS COMPRISING APPLYING TO ONE SIDE OF SAID PHOTOSENSITIVE ELEMENT A LIQUID WHICH IS A SOLVENT FOR SAID DEVELOPER AND COUPLER BUT WHICH IS SUBSTANTIALLY FREE OF DEVELOPER AND COUPLER UPON ITS APPLICATION, PERMEATING SAID APPLIED LIQUID THROUGH SAID EMULSION LAYER BY ABSORBING SAID LIQUID INTO SAID PHOTOSENSITIVE ELEMENT, DISSOLVING COUPLER MATERIAL IN LIQUID PRESENT IN SAID PHOTOSENSITIVE ELEMENT AS A RESULT OF THE ABSORPTION OF SAID APPLIED LIQUID AND DISSOLVING DEVELOPER SUBSTANTIALLY ONLY IN LIQUID WHICH HAS PERMEATED THROUGH SAID EMULSION LAYER AS A RESULT OF ABSORPTION INTO SAID PHOTOSENSITIVE ELEMENT AND FORMING IN
Claim 2
Dependent Claim
163 words
IN A PROCESS OF FORMING POSITIVE IMAGES IN COLOR FROM A NEGATIVE LATENT IMAGE IN A SILVER HALIDE EMULSION LAYER OF A PHOTOSENSITIVE ELEMENT WHEREIN SAID PHOTOSENSITIVE ELEMENT, IN ADDITION TO SILVER HALIDE, CONTAINS A SILVER HALIDE DEVELOPER HAVING AN OXIDATION PRODUCT REACTABLE WITH COUPLER MATERIAL TO FORM IMAGE DYE AND WHEREIN SAID PHOTOSENSITIVE ELEMENT ALSO CONTAINS COUPLER MATERIAL REACTABLE WITH OXIDIZED DEVELOPER TO PROVIDE SAID DYE, THE STEPS COMPRISING APPLYING TO ONE SIDE OF SAID PHOTOSENSITIVE ELEMENT A LIQUID WHICH IS A SOLVENT FOR SAID DEVELOPER AND COUPLER BUT WHICH IS SUBSTANTIALLY FREE OF DEVELOPER AND COUPLER UPON ITS APPLICATION, PERMEATING SAID APPLIED LIQUID THROUGH SAID EMULSION LAYER BY ABSORBING SAID LIQUID INTO SAID PHOTOSENSITIVE ELEMENT, DISSOLVING COUPLER MATERIAL IN LIQUID PRESENT IN SAID PHOTOSENSITIVE ELEMENT AS A RESULT OF THE ABSORPTION OF SAID APPLIED LIQUID AND DISSOLVING DEVELOPER SUBSTANTIALLY ONLY IN LIQUID WHICH HAS PERMEATED THROUGH SAID EMULSION LAYER AS A RESULT OF ABSORPTION INTO SAID PHOTOSENSITIVE ELEMENT AND FORMING IN
References Cited (Backward Citations)
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GB503824A
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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) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |