US3681167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making acrylic-polycarbonate laminate
Assignee: Individual
•
Filing: 1970-07-13
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Granted: 1972-08-01
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Expires: 1990-07-13
Abstract
Abstract A METHOD OF FORMING A LAMINATE OF CAST MONOMERIC ACRYLIC RESIN SHEETS HAVING A CORE OF EXTRUDED POLYCARBONATE RESIN SHEET COMPRISES CONFINING THE SHEETS LATERALLY, MAINTAINING THE EXTERNAL FACES IN CONTACT WITH MIRROR POLISHED PLATES, PREHEATING THE SANDWICH TO THE DISTORTION TEMPERATURE OF THE POLYCARBONATE WHILE APPLYING A LOW PRESSUR ETO EXPEL ENTRAPPED AIR, INCREASING THE PRESSURE TO ABOUT 200-300 P.S.I., MAINTAINING THE TEMPERATURE AT THE FUSION TEMPERATURE OF THE PLASTIC SHEETS TO BOND THEM, AND COOLING TO ABOUT 150*F. WHILE MAINTAINING THE PRESSURE AT ABOUT 100-150 P.S.I., THEREBY PROVIDING A LAMINATE WITH GOOD OPTICAL PROPERTIES.
Inventors
- 👤 Richard E Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:09
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/36; B32B27/365; B32B2309/00; B32B2309/02; B32B2309/022; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |