Patent US4495015A successfully refreshed from Google Patents.
US4495015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled wafer relaxing in making composite lenses
Assignee: Gerber Coburn Optical Inc
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Filing: 1983-09-01
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Granted: 1985-01-22
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Expires: 2003-09-01
Abstract
Abstract Disclosed, in a method for preparing a preformed thermoplastic/thermoset wafer for lamination to a prefinished ophthalmic lens, the improvement comprising: storing the preformed thermoplastic/thermoset wafer immediately after manufacture under refrigerating conditions; and subjecting said stored wafer to a temperature of 90° to 120° F. at 50% to 70% RH for no more than 48 hours just prior to lamination of same to an ophthalmic lens.
Inventors
- 👤 Donald H. Petcen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:28
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/0073; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/40; B32B2305/00; B32B2305/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
In a method of laminating a preformed thermoplastic/thermoset wafer to a pre-finished ophthalmic glass lens of the type, wherein after manufacturing, the preformed thermoplastic/thermoset wafer is positioned against the surface of the pre-finished ophthalmic glass lens so that the thermoplastic side thereof is in contact with said glass surface, said wafer and glass are pressed to form a laminate and subjected to elevated temperatures and high pressures to strengthen bonding therebetween, wherein the improvement comprises: storing said preformed thermoplastic/thermoset wafer immediately after manufacture thereof at a temperature of about 40° to 50° F. at less thant 50% relative humidity; and subjecting said stored wafer to a temperature of about 90° to 120° F. and a relative humidity of about 50% to 70% for 15 to 48 hours just prior to said lamination.
Claim 2
Dependent Claim
132 words
In a method of laminating a preformed thermoplastic/thermoset wafer to a pre-finished ophthalmic glass lens of the type, wherein after manufacturing, the preformed thermoplastic/thermoset wafer is positioned against the surface of the pre-finished ophthalmic glass lens so that the thermoplastic side thereof is in contact with said glass surface, said wafer and glass are pressed to form a laminate and subjected to elevated temperatures and high pressures to strengthen bonding therebetween, wherein the improvement comprises: storing said preformed thermoplastic/thermoset wafer immediately after manufacture thereof at a temperature of about 40° to 50° F. at less thant 50% relative humidity; and subjecting said stored wafer to a temperature of about 90° to 120° F. and a relative humidity of about 50% to 70% for 15 to 48 hours just prior to said lamination.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said wafer is subjected to about 100° to 110° F. and a relative humidity of 55% to 65% for 15 to 48 hours prior to said lamination.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein said wafer is subjected to about 100° to 110° F. and a relative humidity of 55% to 65% for 20-24 hours prior to said lamination.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said wafer comprises: a crosslinked thermoset polyurethane layer and an amorphous thermoplastic polyurethane layer.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein the thickness of said wafer is less than 1 mm.
Claim 7
Dependent Claim
23 words
The method of claim 4 wherein the thickness of the thermosetting layer constitute the major portion of the total thickness of the wafer.
Claim 8
Dependent Claim
17 words
The method of claim 4 wherein said thermoset polymers have a molecular weight of 2,000 to 10,000.
Claim 9
Dependent Claim
17 words
The method of claim 4 wherein said thermoplastic polymers have a molecular weight of 1,000 to 20,000.
References Cited (Backward Citations)
US2408540A
Cited
US3801397A
Cited
US4103070A
Cited
GB1576394A
Cited
SU804589A1
Cited
US4364786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |