US1791604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic instrument
Assignee: American Optical Corp
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Filing: 1927-05-28
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Granted: 1931-02-10
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Expires: 1947-05-28
Abstract
No abstract record available.
Inventors
- 👤 Vincent D Reardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:35
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/1208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-02-09 | 1934-08-11 | 1935-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-02-09 | 1938-08-11 | 1939-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-02-09 | 1942-08-11 | 1943-02-10 | $7700.00 | Window Closed / Lapsed |