Multifocal lens manufacturing process and apparatus
Abstract
Abstract MULTIFOCAL LENS FORMED OF ONE-PIECE MOLDED OR PRESSED MENISCUS LENS BLANKS. AN OPTICALLY FINISHED SURFACE OF A CURVTURE DESIRED FOR NEAR-VISION FIELDS OF THE LENSES IS PRODUCED ON A SUBSTANTIAL PORTION OF ONE UNFINISHED SIDE OF EACH OF A NUMBER OF THE BLANKS WITH A STRAIGHT CLIFF-LIKE LINE OF DIVISION SEPARATING THE OPTICALLY FINISHED AND UNFINISHED PORTIONS OF SAID SIDES OF THE BLANKS. WITH REFERENCING FROM THE FINISHED PORTION OF THE BLANKS, THEY ARE MULTIPLY BLOCKED AND REVOLVED WBOUT AN EXIS RADIALLY SPACED FROM THEIR FINISHED PORTIONS A DISTANCE EQUAL TO RADIAUL OF CURVATURE DESIRED UPON THE UNFINISHED PORTIONS LESS AN AMOUNT EQUAL TO A PRACTICAL MINIMUM OF HEIGHT TO WHICH THE CLIFF-LIKE LINES OF DIVISION ARE TO BE REDUCED. GRINDING AND POLISHING TO THE MINIMUM HEIGHT OF THE LINES OF DIVION DURIG SUCH REVOLUTION FINISHES THE BLANKS. BLOCKING IS PERFORMED WITH AN ALIGNING AND HOLDING FIXTURE WHEREIN THE BLANKS ARE SUPPORTED BY THEIR NEAR-VISION FIELDS.
Inventors
- 👤 Paul Martiros
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |