Patent US3461012A successfully refreshed from Google Patents.
US3461012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of thermoplastic sheet
Assignee: Turner Brothers Asbestos Co Ltd
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Filing: 1965-06-15
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Granted: 1969-08-12
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Expires: 1985-06-15
Abstract
No abstract record available.
Inventors
- 👤 George Leonard Wicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:03
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; E04C2/10; E04C2/20; E04C2/22; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249949; Y10T428/24995; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A METHOD OF PRODUCING A RIGID THERMOPLASTIC SHEET, THE STEPS OF: (A) CONVERTING (1) A THERMOPLASTIC POLYMERIC MATERIAL IN A LIQUID FORM SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS AND EMULSIONS AND (2) LOOSE FIBRES INTO A SUBSTANTIALLY HOMOGENEOUS DOUGH-LIKE MASS, SAID POLYMERIC MATERIAL BEING SUBSTANTIALLY RIGID AT ROOM TEMPERATURE AND COMPRISING AT LEAST A MAJOR PROPORTION OF A POLYMERIC CONSTITUENT BASED ON A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, METHYMETHACRYLATE AND ACRYLONITRILE; (B) FEEDING THE DOUGH-LIKE MASS INTO THE NIP BETWEEN TWO CALENDER BOWLS, ONE OF WHICH IS HEATED, AND GRADUALLY INCREASING THE DISTANCE BETWEEN THE BOWLS, THE MASS BEING BUILT UP IN LAMINATIONS ON THE HEATED BOWL; CUTTING THE SHEET THUS FORMED ON THE BOWL, AND REMOVING IT FROM THE BOWL; ALLOWING THE SHEET THUS REMOVED TO COOL TO A RIGID PRODUCT.
Claim 2
Dependent Claim
137 words
IN A METHOD OF PRODUCING A RIGID THERMOPLASTIC SHEET, THE STEPS OF: (A) CONVERTING (1) A THERMOPLASTIC POLYMERIC MATERIAL IN A LIQUID FORM SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS AND EMULSIONS AND (2) LOOSE FIBRES INTO A SUBSTANTIALLY HOMOGENEOUS DOUGH-LIKE MASS, SAID POLYMERIC MATERIAL BEING SUBSTANTIALLY RIGID AT ROOM TEMPERATURE AND COMPRISING AT LEAST A MAJOR PROPORTION OF A POLYMERIC CONSTITUENT BASED ON A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, METHYMETHACRYLATE AND ACRYLONITRILE; (B) FEEDING THE DOUGH-LIKE MASS INTO THE NIP BETWEEN TWO CALENDER BOWLS, ONE OF WHICH IS HEATED, AND GRADUALLY INCREASING THE DISTANCE BETWEEN THE BOWLS, THE MASS BEING BUILT UP IN LAMINATIONS ON THE HEATED BOWL; CUTTING THE SHEET THUS FORMED ON THE BOWL, AND REMOVING IT FROM THE BOWL; ALLOWING THE SHEET THUS REMOVED TO COOL TO A RIGID PRODUCT.
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) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |