Patent US4056649A successfully refreshed from Google Patents.
US4056649A
Expired / Lapsed
US
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Abrasion resistant optical materials and process for making same
Assignee: United States Department of the Army
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Filing: 1976-09-24
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Granted: 1977-11-01
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Expires: 1996-09-24
Abstract
Abstract An abrasion resistant optical composite comprising a plastic substrate having a chromium layer and a glass layer sequentially deposited thereover.
Inventors
- 👤 John J. Walls, Jr.
- 👤 Richard A. McKyton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:26
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/10174; G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/261; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
40 words
Optical composite comprising an allyl diglycol carbonate substrate, a chromium interlayer of about 50-200A in thickness bonded on said substrate, and a glass layer of about 3.5 μm in thickness, comprising substantially SiO 2 , bonded on said chromium interlayer.
Claim 2
Dependent Claim
40 words
Optical composite comprising an allyl diglycol carbonate substrate, a chromium interlayer of about 50-200A in thickness bonded on said substrate, and a glass layer of about 3.5 μm in thickness, comprising substantially SiO 2 , bonded on said chromium interlayer.
Claim 3
Dependent Claim
25 words
An optical composite in accordance with claim 1, wherein said chromium interlayer is about 75A thick, and said glass layer is about 3.75 μm thick.
Claim 4
Dependent Claim
43 words
Process for forming an optical composite comprising, depositing a chromium coating of about 50-200A in thickness upon an allyl diglycol carbonate substrate, and depositing a glass layer of about 3.25 μm in thickness, composed substantially of SiO 2 , over said chromium coating.
Claim 5
Dependent Claim
43 words
Process for forming an optical composite comprising, depositing a chromium coating of about 50-200A in thickness upon an allyl diglycol carbonate substrate, and depositing a glass layer of about 3.25 μm in thickness, composed substantially of SiO 2 , over said chromium coating.
Claim 6
Dependent Claim
22 words
Process according to claim 3, wherein said depositing of said chromium coating and said glass layer are effected by physical vapor deposition.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |