Patent US3421807A successfully refreshed from Google Patents.
US3421807A
Expired / Lapsed
US
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Zoom lens system for microscope
Assignee: Bausch and Lomb Inc
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Filing: 1967-09-08
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Granted: 1969-01-14
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Expires: 1987-09-08
Abstract
No abstract record available.
Inventors
- 👤 Paul E Nothangle
- 👤 Harold E Rosenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:36
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02; G02B21/025; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/144107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3057259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |