US3301131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tonometer
Assignee: Bausch and Lomb Inc
•
Filing: 1964-03-23
•
Granted: 1967-01-31
•
Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 James R Benford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
AN OPTICAL ELEMENT FOR AN APPLANATION TONOMETER COMPRISING, A PAIR OF ANISOTROPIC CRYSTALS HAVING SUBSTANTIALLY FLAT END FACES AND HAVING OPTICAL AXES INCLINED TO FORM SUBSTANTIALLY EQUAL ACUTE ANGLES TO THE PLANE OF THE FLAT ENDS, MEANS FOR COUPLING SAID PAIR OF CRYSTALS TOGETHER SO THAT THE OPTICAL AXES OF SAID PAIR OF CRYSTALS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |