US3404936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmometer and method of measuring curvature of a cornea
Assignee: OBRIG LAB Inc
•
Filing: 1964-10-01
•
Granted: 1968-10-08
•
Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 Reuel W Bennett
- 👤 Philip L Salvatori
- 👤 Chester J Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:30
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107; G; G01; G01B; G01B11/00; G01B11/24; G01B11/255
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE61626C
Cited
CA625160A
Cited
US679890A
Cited
US1134610A
Cited
US1721208A
Cited
US1918540A
Cited
US2012758A
Cited
US2482669A
Cited
US3201795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |