US3772128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for continuously producing large area light polarizing panels
Assignee: NAPLC
•
Filing: 1970-09-21
•
Granted: 1973-11-13
•
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 03:32
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)
US2577332A
Cited
US3360415A
Cited
US3451876A
Cited
US3481818A
Cited
US3505147A
Cited
US3574019A
Cited
US3526000A
Cited
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 |