US3578447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dye developer color liffusion transfer processes and elements comprising alpha and gamma hydroxy and gamma amino substituted pyridines
Assignee: Polaroid Corp
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Filing: 1969-05-02
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Granted: 1971-05-11
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Expires: 1989-05-02
Abstract
Abstract DYE-DEVELOPER DIFFUSION TRANSFER COLOR PROCESSES AND ELEMENTS AND COMPOSITIONS FOR EMPLOYMENT THEREIN, COMPRISING A COMPOUND SELECTED FROM ALPHA AND GAMMA HYDROXY AND GAMMA AMINO SUBSTITUTED PYDRIDINES ADAPTED TO REACT WITH THE OXIDATION PRODUCTS OF THE DYE DEVELOPERS TO PROVIDE DURING PROCESSING A PRODUCT WHICH IS LESS DIFFUSIBLE IN THE PROCESSING COMPOSITION THAN THE SAID DYE DEVELOPER OXIDATION PRODUCTS.
Inventors
- 👤 Myron S Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:38
CPC Classifications
G; G03; G03C; G03C8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |