US3439680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical instrument for cataract removal
Assignee: Northwestern University
•
Filing: 1965-04-12
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Granted: 1969-04-22
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Edward R Thomas Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61B2018/00005; A61B2018/00041; A61F; A61F9/00; A61F9/007; A61F9/00736
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1516437A
Cited
US2645097A
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US2672032A
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US2814296A
Cited
US3254652A
Cited
US3272203A
Cited
US3298371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |