US2531665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of expanded thermoplastic materials
Assignee: Expanded Rubber Co Ltd
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Filing: 1946-11-13
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Granted: 1950-11-28
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Expires: 1966-11-13
Abstract
No abstract record available.
Inventors
- 👤 Booth Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29C44/3446; B29C44/3469; B29C44/348
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR THE PRODUCTION OF AN EXPANDED THERMOPLASTIC MATERIAL WHICH COMPRISES SUBMITTING THE MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYSTYRENE, POLYMETHYLMETHACRYLATE, POLYETHYLENE, AND CELLULOSE ESTERS AND ETHERS AT A TEMPERATURE OF THE ORDER OF 100 TO 125*C. TO IMPREGNATION WITH AN INERT GAS UNDER PRESSURE WITHOUT THE AID OF A VOLATILE SOLVENT AND COOLING THE MATERIAL UNTIL RIGID BEFORE RELEASING THE PRESSURE, THEN HEATING THE MATERIAL TO THE PLASTIC STATE IN A SUFFICIENTLY CONFINED SPACE TO PREVENT ANY SUBSTANTIAL EXPANSION OF THE MATERIAL FROM THE ABSORBED GAS, AND CONSEQUENTLY TO PREVENT ANY CELL FORMATION DURING THE HEATING UP, AND WHEN THE MATERIAL IS PLASTIC THROUGHOUT SUDDENLY RELEASING IT FROM CONFINEMENT AND RAPIDLY COOLING THE EXPANDED PRODUCT.
Claim 2
Dependent Claim
118 words
A PROCESS FOR THE PRODUCTION OF AN EXPANDED THERMOPLASTIC MATERIAL WHICH COMPRISES SUBMITTING THE MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYSTYRENE, POLYMETHYLMETHACRYLATE, POLYETHYLENE, AND CELLULOSE ESTERS AND ETHERS AT A TEMPERATURE OF THE ORDER OF 100 TO 125*C. TO IMPREGNATION WITH AN INERT GAS UNDER PRESSURE WITHOUT THE AID OF A VOLATILE SOLVENT AND COOLING THE MATERIAL UNTIL RIGID BEFORE RELEASING THE PRESSURE, THEN HEATING THE MATERIAL TO THE PLASTIC STATE IN A SUFFICIENTLY CONFINED SPACE TO PREVENT ANY SUBSTANTIAL EXPANSION OF THE MATERIAL FROM THE ABSORBED GAS, AND CONSEQUENTLY TO PREVENT ANY CELL FORMATION DURING THE HEATING UP, AND WHEN THE MATERIAL IS PLASTIC THROUGHOUT SUDDENLY RELEASING IT FROM CONFINEMENT AND RAPIDLY COOLING THE EXPANDED 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) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |