Patent US3772128A successfully refreshed from Google Patents.
US3772128A
Expired / Lapsed
US
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Machine for continuously producing large area light polarizing panels
Assignee: NAPLC
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Filing: 1970-09-21
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Granted: 1973-11-13
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Expires: 1990-09-21
Abstract
Abstract A large area light polarizing panel is continuously produced by laminating a layer of a light transmitting foamed cellular plastic material between a self supporting plastic base sheet and a thin plastic cover sheet while the base sheet is hot enough to cause the members to bond together.
Inventors
- 👤 M Kahn
- 👤 W Werderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:36
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29; B29C; B29C67/00; B29C67/20; B32B37/00; B32B37/08; B32B5/00; B32B5/18; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; B32B2307/00; B32B2307/40; B32B2307/42; B32B2551/00; B32B2607/00; F; F21; F21V; F21V3/00; F21V3/04; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1741
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A device according to claim 1 in which the first set of laminating rollers are watercooled to reduce the temperature of the base plastic.
Claim 2
Dependent Claim
20 words
A device according to claim 1 in which the base plastic temperature is reduced by a source of cooling air.
Claim 3
Dependent Claim
59 words
A device according to claim 1 in which the second rollers include a let off roller spaced from the surface of the base plastic not less than one-sixteenth of an inch and not more than three-eighths of an inch whereby the cellular plastic material makes a flat angle with the base plastic as the approach the first laminating rollers.
References Cited (Backward Citations)
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |