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US4064308A
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Abrasion and antifog-resistant optical element
Assignee: Aearo Technologies LLC
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Filing: 1976-08-24
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Granted: 1977-12-20
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Expires: 1996-08-24
Abstract
Abstract An optical element is provided having a durable abrasion-resistant, antifog coating applied to at least one surface thereof by coating an optical element comprised of an inorganic or organic transparent base with a transparent abrasion-resistant antifog coating consisting of a lightly cross-linked polyvinyl alcohol, the desired degree of cross-linking being obtained by utilizing a combination of zirconium nitrate and formaldehyde as cross-linking agents.
Inventors
- 👤 Bernard L. Laurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:17
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/046; C08J7/054; C08K; C08K3/00; C08K3/28; C09; C09J; C09J129/00; C09J129/02; C09J129/04; C09K; C09K3/00; C09K3/18; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; G02B1/18; C08J2429/00; C08L; C08L2666/00; C08L2666/54; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31; Y10T428/315; Y10T428/31504; Y10T428/31507; Y10T428/8305
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
An abrasion-resistant optical element comprising a transparent base element of glass or plastic having a transparent, abrasion-resistant, antifogging coating on at least one surface thereof comprising a cross-linked polyvinyl alcohol wherein said polyvinyl alcohol is cross-linked with a curing agent which is composed of 1 to 3 parts by weight of zirconium nitrate and 3 to 1 parts by weight of formaldehyde, said curing agent constituting 0.2 to 0.8 percent by weight, on a solids basis, of the total weight of polyvinyl alcohol and curing agent.
Claim 2
Dependent Claim
86 words
An abrasion-resistant optical element comprising a transparent base element of glass or plastic having a transparent, abrasion-resistant, antifogging coating on at least one surface thereof comprising a cross-linked polyvinyl alcohol wherein said polyvinyl alcohol is cross-linked with a curing agent which is composed of 1 to 3 parts by weight of zirconium nitrate and 3 to 1 parts by weight of formaldehyde, said curing agent constituting 0.2 to 0.8 percent by weight, on a solids basis, of the total weight of polyvinyl alcohol and curing agent.
Claim 3
Dependent Claim
14 words
The optical element of claim 1 wherein said transparent base element is a polycarbonate.
Claim 4
Dependent Claim
15 words
The optical element of claim 1 wherein said transparent base element is allyl diglycol carbonate.
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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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |