US3512976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonium and metal sulfites as stabilizers of light sensitive systems
Assignee: Bell and Howell Co
•
Filing: 1966-07-21
•
Granted: 1970-05-19
•
Expires: 1986-07-21
Abstract
No abstract record available.
Inventors
- 👤 Yoshikazu Yamada
- 👤 Homas H Garland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/675
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3255013A
Cited
US3374094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |