Patent US4247492A successfully refreshed from Google Patents.
US4247492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling the adhesion of cast lenses to the mold
Assignee: BOISSEVAIN Ltd Inc
•
Filing: 1979-06-28
•
Granted: 1981-01-27
•
Expires: 1999-06-28
Abstract
Abstract A method of increasing the adhesion of a cast polymer lens to a resinous lens mold by subjecting the resinous mold material to high internal shear force to alter the molecular structure of the resinous mold material to provide for greater bonding between the mold and lens material.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:09
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00028; B29D11/00932; B29D11/00942; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of: providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast lens material and the resinous mold, providing a positive lens mold, having a first optical surface curvature, forming a negative optical mold from the positive optical mold by applying said heat softened resinous mold material against the first surface curvature, covering the resinous optical negative mold with a liquid monomer lens material, allowing the said lens material to polymerize to thereby form a lens having a finished optical surface.
Claim 2
Independent Claim
122 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of: providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast lens material and the resinous mold, providing a positive lens mold, having a first optical surface curvature, forming a negative optical mold from the positive optical mold by applying said heat softened resinous mold material against the first surface curvature, covering the resinous optical negative mold with a liquid monomer lens material, allowing the said lens material to polymerize to thereby form a lens having a finished optical surface.
Claim 3
Dependent Claim
35 words
A method as in claim 1 wherein a second optical surface is cut and polished on the polymerized lens material while the lens material is supported upon the resinous mold adjacent to the lens material.
Claim 4
Independent Claim
79 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast liquid monomer lens material which is placed over the resinous negative mold and allowed to polymerize to thereby form a lens having a finished optical surface.
Claim 5
Independent Claim
79 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast liquid monomer lens material which is placed over the resinous negative mold and allowed to polymerize to thereby form a lens having a finished optical surface.
Claim 6
Independent Claim
87 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, by being forced through an orifice under pressure, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast liquid monomer lens material which is placed over the resinous negative mold and allowed to polymerize to thereby form a lens having a finished optical surface.
Claim 7
Independent Claim
87 words
A method of increasing the adhesion of cast plastic lenses to a resinous lens mold, comprising the steps of providing a heat softening resinous mold material, subjecting the said mold material to internal shear force, by being forced through an orifice under pressure, which alters the polymeric structure by cleavage of molecular polymeric chains, thereby increasing the bonding between the cast liquid monomer lens material which is placed over the resinous negative mold and allowed to polymerize to thereby form a lens having a finished optical surface.
References Cited (Backward Citations)
US2935502A
Cited
US3248469A
Cited
US3422168A
Cited
BE745135A
Cited
US3830460A
Cited
US4121896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |