US3297422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making molds for multifocal ophthalmic lenses
Assignee: UNVIVIS Inc
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Filing: 1963-04-05
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Granted: 1967-01-10
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 Stanley A Emerson
- 👤 George A Beasley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00413; C; C03; C03B; C03B23/00; C03B23/20; C03B23/22; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
THE METHOD OF MAKING A MOLD FOR USE IN MOLDING MULTI-FOCAL OPHTHALMIC LENS SURFACES ON THE FRONT SURFACE OF THE LENS FROM PLASTIC MATERIAL WHICH COMPRISES: FIRST PROVIDING A GLASS BLANK; GRINDING AND POLISHING ON THE REAR FACE OF THE BLANK A FIRST CONCAVE CURVED SURFACE FOR MOLDING ONE OF THE FIELDS OF VISION OF THE FRONT LENS SURFACE AND HAVING A CURVATURE COMPLEMENTARY TO THE DESIRED CURVATURE OF THE NEAR FIELD OF VISION AND COVERING A PORTION OF THE REAR FACE; PROVIDING A SMALL GLASS SEGMENT HAVING A BACK CONVEX CURVED SURFACE CURVED TO CONFORM WITH THE FIRST CURVED SURFACE OF THE BLANK; APPLYING THE GLASS SEGMENT TO THE FACE OF THE GLASS BLANK WITH THE CURVED BACK SURFACE IN CONTACT WITH THE FIRST CURVED SURFACE OF THE BLANK AND ADHERING THEM TO EACH OTHER; AND FINALLY, GRINDING AND POLISHING ON THE NEAR FACE OF THE ASSEMBLY INCLUDING AT LEAST THE FACE OF THE SEGMENT A SECOND CONCAVE SURFACE FOR MOLDING ANOTHER FIELD OF VISION OF THE LENS SURFACE AND HAVING A CURVATURE COMPLEMENTARY TO THE DESIRED CURVATURE OF SAID ANOTHER FIELD OF VISION SO THAT AN EDGE OF THE SEGMENT DEFINES A BOUNDARY BETWEEN THE TWO FIELDS OF VISION.
Claim 2
Independent Claim
201 words
THE METHOD OF MAKING A MOLD FOR USE IN MOLDING MULTI-FOCAL OPHTHALMIC LENS SURFACES ON THE FRONT SURFACE OF THE LENS FROM PLASTIC MATERIAL WHICH COMPRISES: FIRST PROVIDING A GLASS BLANK; GRINDING AND POLISHING ON THE REAR FACE OF THE BLANK A FIRST CONCAVE CURVED SURFACE FOR MOLDING ONE OF THE FIELDS OF VISION OF THE FRONT LENS SURFACE AND HAVING A CURVATURE COMPLEMENTARY TO THE DESIRED CURVATURE OF THE NEAR FIELD OF VISION AND COVERING A PORTION OF THE REAR FACE; PROVIDING A SMALL GLASS SEGMENT HAVING A BACK CONVEX CURVED SURFACE CURVED TO CONFORM WITH THE FIRST CURVED SURFACE OF THE BLANK; APPLYING THE GLASS SEGMENT TO THE FACE OF THE GLASS BLANK WITH THE CURVED BACK SURFACE IN CONTACT WITH THE FIRST CURVED SURFACE OF THE BLANK AND ADHERING THEM TO EACH OTHER; AND FINALLY, GRINDING AND POLISHING ON THE NEAR FACE OF THE ASSEMBLY INCLUDING AT LEAST THE FACE OF THE SEGMENT A SECOND CONCAVE SURFACE FOR MOLDING ANOTHER FIELD OF VISION OF THE LENS SURFACE AND HAVING A CURVATURE COMPLEMENTARY TO THE DESIRED CURVATURE OF SAID ANOTHER FIELD OF VISION SO THAT AN EDGE OF THE SEGMENT DEFINES A BOUNDARY BETWEEN THE TWO FIELDS OF VISION.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |