US3940304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making composite light-polarizing element
Assignee: Polaroid Corp
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Filing: 1974-04-01
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Granted: 1976-02-24
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Expires: 1994-04-01
Abstract
Abstract A composite light-polarizing lens comprising a light-polarizing element having coated on each surface thereof a layer which enhances adhesion between in situ formed lens components and inhibits migration of lens constituents between said light-polarizing elements and said in situ polymerized components during formation of said lens.
Inventors
- 👤 Norman W. Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00528; B29D11/00413; B29D11/0073; B29D11/00865; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/049; G02C7/12; G02C2202/00; G02C2202/16; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
The method of manufacturing synthetic plastic light-polarizing ophthalmic lens which comprises: applying as a continuous coating on each surface of a light-polarizing element a layer which enhances adhesion between said light-polarizing element and subsequently in situ polymerized lens components and significantly inhibits migration of lens constituents to said light-polarizing element during polymerization; securing said coated light-polarizing element into a mold; providing a continuous layer of a synthetic plastic monomeric material over the entire surface of each side of said light-polarizing element which will comprise the light transmission area of the ultimately formed lens; and causing said monomeric material to polymerize thereby forming a composite light-polarizing ophthalmic lens.
Claim 2
Independent Claim
107 words
The method of manufacturing synthetic plastic light-polarizing ophthalmic lens which comprises: applying as a continuous coating on each surface of a light-polarizing element a layer which enhances adhesion between said light-polarizing element and subsequently in situ polymerized lens components and significantly inhibits migration of lens constituents to said light-polarizing element during polymerization; securing said coated light-polarizing element into a mold; providing a continuous layer of a synthetic plastic monomeric material over the entire surface of each side of said light-polarizing element which will comprise the light transmission area of the ultimately formed lens; and causing said monomeric material to polymerize thereby forming a composite light-polarizing ophthalmic lens.
Claim 3
Dependent Claim
12 words
The invention of claim 1 wherein said continuous coating comprises crosslinked nitrocellulose.
Claim 4
Dependent Claim
15 words
The invention of claim 2 wherein said coating additionally comprises a melamine formaldehyde condensation polymer.
Claim 5
Dependent Claim
16 words
The invention of claim 3 wherein said melamine formaldehyde condensation polymer is a melamine/urea-formaldehyde condensation polymer.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |