US2768407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Introducing thermoplastic
Assignee: —
•
Filing: —
•
Granted: 1956-10-30
•
Expires: 1973-10-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A PROCESS OF PRODUCING A CLOSED-CELL GAS-CONTAINING CELLULAR THERMOPLASTIC RESIN ARTICLE HAVING A UNIFORM CELL STRUCTURE, COMPRISING THE STEPS OF FORMING IN A CLOSED MOLDING MEANS A HEATED GELATINIZED GAS-CONTAINING THERMOPLASTIC RESIN MASS CONTAINING SAID GAS DISSOLVED THEREIN AND HAVING A SPECIFIC VOLUME AND BEING UNDER PRESURE SO THAT SAID GAS DISSOLVED IN SAID RESIN MASS IS UNDER PRESSURE; INCREASING THE VOLUME OF SAID HEATED GELATINIZED RESIN MASS BY ABOUT 1/5-2/5 WHILE CORRESPONDINGLY REDUCING THE PRESSURE THEREON SO AS TO LIBERATE SAID DISSOLVED GAS AND FROM SMALL CELLS CONTAINING GAS UNDER PRESSURE IN SAID GELATINZED RESIN MASS, AND MAINTAINING SAID INCREASED VOLUME AND REDUCED PRESSURE UNTIL SAID GAS HAS FORMED SMALL UNIFORM CELLS CONTAINING SAID GAS UNDER PRESSURE DISTRIBUTED THROUGHOUT SAID HEATED GELATINIZED RESIN MASS; COOLING SAID RESIN MASS CONTAINING SAID SMALL CELLS CONTAINING GAS UNDER PRESSURE WHILE MAINTAINING SAID INCREASED VOLUME AND REDUCED PRESSURE SO AS TO OBTAIN A COOLED RESIN MASS CONTAINING SMALL CELLS WITH GAS UNDER PRESSURE; FURTHER REDUCING THE PRESSURE ON SAID COOLED RESIN MASS CONTAINING SMALL CELLS HAVING GAS UNDER PRESSURE, REMOVING THE SAME FROM SAID MOLDING MEANS AND EXPANDING IT BY HEATING WITHOUT APPLICATION OF PRESSURE SO AS TO FORM A CLOSED-CELL UNIFROMLY CELLULAR RESIN BODY.
Claim 2
Dependent Claim
202 words
A PROCESS OF PRODUCING A CLOSED-CELL GAS-CONTAINING CELLULAR THERMOPLASTIC RESIN ARTICLE HAVING A UNIFORM CELL STRUCTURE, COMPRISING THE STEPS OF FORMING IN A CLOSED MOLDING MEANS A HEATED GELATINIZED GAS-CONTAINING THERMOPLASTIC RESIN MASS CONTAINING SAID GAS DISSOLVED THEREIN AND HAVING A SPECIFIC VOLUME AND BEING UNDER PRESURE SO THAT SAID GAS DISSOLVED IN SAID RESIN MASS IS UNDER PRESSURE; INCREASING THE VOLUME OF SAID HEATED GELATINIZED RESIN MASS BY ABOUT 1/5-2/5 WHILE CORRESPONDINGLY REDUCING THE PRESSURE THEREON SO AS TO LIBERATE SAID DISSOLVED GAS AND FROM SMALL CELLS CONTAINING GAS UNDER PRESSURE IN SAID GELATINZED RESIN MASS, AND MAINTAINING SAID INCREASED VOLUME AND REDUCED PRESSURE UNTIL SAID GAS HAS FORMED SMALL UNIFORM CELLS CONTAINING SAID GAS UNDER PRESSURE DISTRIBUTED THROUGHOUT SAID HEATED GELATINIZED RESIN MASS; COOLING SAID RESIN MASS CONTAINING SAID SMALL CELLS CONTAINING GAS UNDER PRESSURE WHILE MAINTAINING SAID INCREASED VOLUME AND REDUCED PRESSURE SO AS TO OBTAIN A COOLED RESIN MASS CONTAINING SMALL CELLS WITH GAS UNDER PRESSURE; FURTHER REDUCING THE PRESSURE ON SAID COOLED RESIN MASS CONTAINING SMALL CELLS HAVING GAS UNDER PRESSURE, REMOVING THE SAME FROM SAID MOLDING MEANS AND EXPANDING IT BY HEATING WITHOUT APPLICATION OF PRESSURE SO AS TO FORM A CLOSED-CELL UNIFROMLY CELLULAR RESIN BODY.
References Cited (Backward Citations)
US1515475A
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US2405345A
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US2576749A
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US2450436A
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US2525966A
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US2577381A
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US2576911A
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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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |