US2962930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical objective
Assignee: Bell and Howell Co
•
Filing: 1958-11-13
•
Granted: 1960-12-06
•
Expires: 1978-11-13
Abstract
No abstract record available.
Inventors
- 👤 Walter J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:26
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US444714A
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US682017A
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US775353A
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DE177266C
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US895045A
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US1352028A
Cited
US1776398A
Cited
US1939098A
Cited
US2202749A
Cited
US2391114A
Cited
GB601649A
Cited
US2720814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |