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US4127682A
Expired / Lapsed
US
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Abrasion and antifog-resistant optical element
Assignee: Aearo Technologies LLC
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Filing: 1977-09-21
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Granted: 1978-11-28
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Expires: 1997-09-21
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
2026-10-28 18:55
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/046; C08J7/054; C09; C09D; C09D129/00; C09D129/02; C09D129/04; C09D4/00; 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
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
The process of forming an abrasion-resistant antifogging optical element of glass or plastic transparent base element comprising: initially preparing the surface of said transparent base element to provide adequate bonding of the coating to be subsequently applied and thereafter applying a durable abrasion-resistant antifogging coating comprising a polyvinyl alcohol lightly cross-linked with a combination of zirconium nitrate and formaldehyde.
Claim 2
Dependent Claim
59 words
The process of forming an abrasion-resistant antifogging optical element of glass or plastic transparent base element comprising: initially preparing the surface of said transparent base element to provide adequate bonding of the coating to be subsequently applied and thereafter applying a durable abrasion-resistant antifogging coating comprising a polyvinyl alcohol lightly cross-linked with a combination of zirconium nitrate and formaldehyde.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said transparent base element is an allyl diglycol carbonate and adequate bonding is obtained by a hydrolytic surface treatment.
Claim 4
Dependent Claim
33 words
The process of claim 2 wherein said polyvinyl alcohol is cured at a temperature of about 100° C. to about 175° C. for a period of about 2 minutes to about 30 minutes.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein the surface of said transparent base element is hydrolytically treated with an aqueous solution of a caustic.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein said caustic is sodium hydroxide.
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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |