Patent US3661673A successfully refreshed from Google Patents.
US3661673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making plastic laminate having high abrasion resistance
Assignee: Woodall Industries Inc
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Filing: 1969-05-01
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Granted: 1972-05-09
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Expires: 1989-05-01
Abstract
Abstract A process for making a resin impregnated laminated sheet material and the resultant laminate produced therefrom which is provided with an abrasion-resistant surface layer comprising a cured resin incorporating a controlled quantity of substantially spherically shaped transparent glass beads of controlled size which are distributed substantially uniformly through the surface layer.
Inventors
- 👤 John B Merriam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:04
CPC Classifications
B; B32; B32B; B32B37/00; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B37/14; B32B37/16; B32B37/20; B44; B44C; B44C5/00; B44C5/04; B44C5/0469; B44C5/0476; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2255/00; B32B2255/02; B32B2255/26; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/554; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
The method as described in claim 1, wherein said coating is applied in the form of a layer of substantially uniform thickness.
Claim 2
Dependent Claim
24 words
The method as described in claim 1, wherein said glass beads are all of a size corresponding substantially to the thickness of said coating.
Claim 3
Dependent Claim
28 words
The method as described in claim 1 wherein a plurality of plies are impregnated with said impregnating resin and are positioned in face-to-face overlying relationship prior to curing.
Claim 4
Dependent Claim
21 words
The method as described in claim 1 wherein said impregnating resin and said resin of said coating are a polyester resin.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |