US3674478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel products and processes
Assignee: Polaroid Corp
•
Filing: 1970-12-17
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Granted: 1972-07-04
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Expires: 1990-12-17
Abstract
Abstract INTEGRAL NEGATIVE-POSITIVE FILM UNITS ADAPTED FOR FORMING COLOR TRANSFER IMAGES, WHICH FILM UNITS INCLUDE A NOVEL COMPOUND WHICH RELEASES A "DEVELOPMENT RESTRAINER" IN THE PRESENCE OF ALKALI AND WHICH MAY BE DEFINED AS A QUINONE- OR NAPHTHOQUINONE-METHIDE PRECURSOR CONTAINING A DEVELOPMENT RESTRAINER MOIETY.
Inventors
- 👤 J Michael Grasshoff
- 👤 Lloyd D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/243; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/34; G03C5/00; G03C5/26; G03C5/29; G03C5/30; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |