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Patent US3511561A successfully refreshed from Google Patents.
US3511561A
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Optical system for ophthalmometers provided with stationary sighting marks
Assignee: Individual
•
Filing: 1965-10-18
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Granted: 1970-05-12
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Paul Frederic Marie Gambs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:54
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/24; G01B11/255; A; A61; A61B; A61B3/00; A61B3/10; A61B3/107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733634A
Cited
US1721208A
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US1750931A
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US1918540A
Cited
US2078586A
Cited
US2107305A
Cited
US2179850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |