US3216308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft landing sight including collimating mangin mirror and corrector lens
Assignee: Individual
•
Filing: 1961-10-05
•
Granted: 1965-11-09
•
Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 Marvin J Northcutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:06
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2352644A
Cited
US2358316A
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US2441160A
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US2490747A
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DE880946C
Cited
US2895372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |