Patent US3433559A successfully refreshed from Google Patents.
US3433559A
Expired / Lapsed
US
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Variable focal length optical system
Assignee: Individual
•
Filing: 1964-02-25
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Granted: 1969-03-18
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Expires: 1984-02-25
Abstract
No abstract record available.
Inventors
- 👤 Karl Vockenhuber
- 👤 Karl Bystricky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/16; G02B15/163; G02B15/167; G02B15/173; G02B13/00; G02B13/22; G02B15/144; G02B15/1441; G02B15/144113; G02B15/145; G02B15/1451; G02B15/145121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3293457A
Cited
US1091933A
Cited
GB536706A
Cited
US2804802A
Cited
US3038378A
Cited
US3045545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |