Patent FR1374721A successfully refreshed from Google Patents.
US3560598A
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Process for making plastic multifocal lenses
Assignee: SOLA USA Inc A DE CORP
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Filing: 1968-10-11
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Granted: 1971-02-02
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Expires: 1988-10-11
Abstract
Abstract A METHOD FOR MAKING MONOCENTRIC BIFOCAL CONTACT LENSES. THE READING SEGMENT BEING COMPOSED OF A MATERIAL POSESSING A HIGHER INDEX OF REFRACTION THAN THE MATERIAL OF THE LENS AND BEING SEMI-CIRCULAR IN SHAPE AND THE OPTICAL CENTER OF THE READING SEGMENT LOCATED AT THE CENTER OF THE UPPER STRAIGHT EDGE OF THE SEMICIRCULAR READING SEGMENT.
Inventors
- 👤 Charles W Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00028
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |