US3344692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing aspheric contact lenses
Assignee: Individual
•
Filing: 1965-10-01
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Granted: 1967-10-03
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Expires: 1985-10-01
Abstract
No abstract record available.
Inventors
- 👤 Volk David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:57
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/04; B24B13/046; B23; B23B; B23B5/00; B23B5/36; B23B5/40; Y; Y10; Y10T; Y10T82/00; Y10T82/14; Y10T82/148; Y10T82/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
THE METHOD OF GENERATING AS ASPHERICAL SURFACE ON A WORKPIECE OF OPTICAL MATERIAL COMPRISING ROTATING A WORKPIECE ABOUT A WORK AXIS AND CAUSING RELATIVE APPROACH MOVEMENT BETWEEN THE WORKPIECE AND A TOOL HAVING A GENERALLY ELLIPTICAL CUTTING FACE WHILE HOLDING THE PLANE OF THE CUTTING FACE AT AN ANGLE TO THE AXIS OF THE WORKPIECE WITH THE APEX OF THE ELLIPTICAL FACE COINCIDENT WITH THE WORK AXIS.
References Cited (Backward Citations)
US2237744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |