US4064308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 19:00
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.
References Cited (Backward Citations)
US2310223A
Cited
US2455936A
Cited
US3318856A
Cited
US3525636A
Cited
US3652328A
Cited
US3700487A
Cited
US3840482A
Cited
US3933407A
Cited
US3986997A
Cited
US4027073A
Cited
US3971872A
Cited
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 |