Patent US3400212A successfully refreshed from Google Patents.
US3400212A
Expired / Lapsed
US
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Control mechanisms for an optical objective having a zoom control element
Assignee: Rank Precision Industries Ltd
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Filing: 1967-08-28
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Granted: 1968-09-03
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Expires: 1987-08-28
Abstract
No abstract record available.
Inventors
- 👤 Dexter R Plummer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:46
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/46; H02P5/50; G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/08; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2147674A
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US2443048A
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US2720817A
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US2782683A
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US2891206A
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US2984154A
Cited
US3093784A
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US3283231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |