US3662040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for lathe grinding multifocal contact lenses
Assignee: Novartis Corp
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Filing: 1970-01-08
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Granted: 1972-05-09
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Expires: 1990-01-08
Abstract
Abstract A multifocal or bifocal contact lens is made on a convention radius turning lathe has two supports, one for the work or lens blank and the other for the tool. The tool is rotated about an axis fixed on its support so that the point of the tool describes a circle. The blank is held fixed on its support. Upon relative angular movement of the supports, a spherical segment is cut in the blank, with the center of curvature falling along the axis of rotation of the tool whereby monocentricity is achieved. By such grinding technique, a segment for near view may be formed having a desirable configuration in which nasal rotation of the lens is noncritical.
Inventors
- 👤 Jacques Urbach
- 👤 Harold W Wiene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00932; B23; B23B; B23B5/00; B23B5/36; B23B5/40; B24; B24B; B24B13/00; B24B13/0012; B29D11/00009; B29D11/00028
Claims Analysis
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |