Patent US3526447A successfully refreshed from Google Patents.
US3526447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical systems
Assignee: Specto Avionics Ltd
•
Filing: 1966-06-15
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Granted: 1970-09-01
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Expires: 1986-06-15
Abstract
No abstract record available.
Inventors
- 👤 Charles Gorrie Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:55
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA757362A
Cited
US2467831A
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US2453122A
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US2434109A
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US2957384A
Cited
US3182576A
Cited
US3137769A
Cited
US3339203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |