US4159292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling the release of a cast plastic lens from a resinous lens mold
Assignee: BOISSEVAIN Ltd Inc
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Filing: 1978-02-07
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Granted: 1979-06-26
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Expires: 1998-02-07
Abstract
Abstract Controlling the release of cast polymeric optical lenses from a resinous optical mold by coating the resinous mold material particles with a release agent before forming the resinous material into a lens mold.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; B; B29; B29C; B29C33/00; B29C33/38; B29C33/40; B29C33/56; B29C33/58; B29C33/60; B29C33/62; B29C33/64; B29C39/00; B29C39/02; B29C39/026; B29C43/00; B29C43/006; B29D; B29D11/00; B29D11/00009; B29D11/00019; B29D11/00413; B29D11/00432; B29D11/00442; B29D11/00932; B29D11/00942; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29K; B29K2105/00; B29K2105/0002; B29K2823/00; B29K2877/00; B29L; B29L2011/00; B29L2011/0016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A method of controlling the release of a cast polymeric lens from a resinous lens mold by the steps of selecting a granular resinous molding material, coating the surface of each granule of said granular resinous material with a selected release agent, applying sufficient heat and pressure within a closed mold to fuse the resinous particles into the form of a lens mold having an optical surface, the selected release agent being present on the optical surface of said resinous lens mold, casting a liquid monomer in the resinous mold covering the optical surface, polymerizing the liquid monomer to form a solid monolitic mass having a molded optical lens surface in contact with the release agent present on the surface of the resinous lens mold, removing the lens from the resinous mold.
Claim 2
Independent Claim
132 words
A method of controlling the release of a cast polymeric lens from a resinous lens mold by the steps of selecting a granular resinous molding material, coating the surface of each granule of said granular resinous material with a selected release agent, applying sufficient heat and pressure within a closed mold to fuse the resinous particles into the form of a lens mold having an optical surface, the selected release agent being present on the optical surface of said resinous lens mold, casting a liquid monomer in the resinous mold covering the optical surface, polymerizing the liquid monomer to form a solid monolitic mass having a molded optical lens surface in contact with the release agent present on the surface of the resinous lens mold, removing the lens from the resinous mold.
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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |