Patent US3516735A successfully refreshed from Google Patents.
US3516735A
Expired / Lapsed
US
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Large relative aperture plastic lens system
Assignee: Melpar Inc
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Filing: 1968-08-26
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Granted: 1970-06-23
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Expires: 1988-08-26
Abstract
No abstract record available.
Inventors
- 👤 William V Goodell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:15
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34; G02B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB593514A
Cited
US3363964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |