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Patent US3512860A successfully refreshed from Google Patents.
US3512860A
Expired / Lapsed
US
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Vertical illuminator for stereoscopic microscopy
Assignee: American Optical Corp
•
Filing: 1968-02-15
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Granted: 1970-05-19
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Expires: 1988-02-15
Abstract
No abstract record available.
Inventors
- 👤 Donald H Hansen
- 👤 Howard A Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:54
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/18; G02B21/20; G02B21/22; G02B21/06; G02B21/08; G02B21/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2471879A
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US2901943A
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US3007371A
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US3202041A
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US3143032A
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US3191493A
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US3297391A
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US3405990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |