Patent US3689270A successfully refreshed from Google Patents.
US3689270A
Expired / Lapsed
US
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Light-sensitive compositions comprising a silver salt of a tetraazaindene
Assignee: 3M Co
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Filing: 1969-01-03
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Granted: 1972-09-05
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Expires: 1989-01-03
Abstract
Abstract A LIGHT-SENSITIVE COMPOSITION COMPRISING THE SILVER SALT OF A TETRAAZAINDENE COMPOUND AND INTIMATELY ASSOCIATED PORTION OF SILVER HALIDE IS SHOWN, TOGETHER WITH METHODS FOR PREPARING THE COMPOSITION.
Inventors
- 👤 George De Winter Anderson
- 👤 Hatfield Broad Oak
- 👤 Ronald E Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:43
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C1/00; G03C1/494
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |