Patent US3443940A successfully refreshed from Google Patents.
US3443940A
Expired / Lapsed
US
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Diffusion transfer employing ringclosure to release color-providing material for transfer
Assignee: Polaroid Corp
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Filing: 1967-07-24
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Granted: 1969-05-13
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Expires: 1987-07-24
Abstract
No abstract record available.
Inventors
- 👤 Stanley M Bloom
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:10
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; C; C07; C07C; C07C205/00; C07C205/49; C07C205/57; C07C205/59; C09; C09B; C09B1/00; C09B1/50; C09B1/503; C09B1/51; C09B1/515; C09B1/54; C09B1/545; C09B43/00; C09B43/32; C09B43/325; C09B45/00; C09B45/02; C09B45/14; C09B45/16; G03C8/04; G03C8/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3362819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |