US3544207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter control mechanism
Assignee: Bell and Howell Co
•
Filing: 1968-01-03
•
Granted: 1970-12-01
•
Expires: 1988-01-03
Abstract
No abstract record available.
Inventors
- 👤 Robert S John Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:27
CPC Classifications
G; G03; G03B; G03B41/00; G03B41/02; G03B41/04; G03B41/10; G03B9/00; G03B9/08; G03B9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB245772A
Cited
US1749394A
Cited
US2083646A
Cited
US2215464A
Cited
US2504734A
Cited
US2588813A
Cited
US2843006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |