Patent US2959508A successfully refreshed from Google Patents.
US2959508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for expanding thermoplastic resinous materials and articles thereby obtained
Assignee: Dow Chemical Co
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Filing: 1956-01-30
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Granted: 1960-11-08
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Expires: 1976-01-30
Abstract
No abstract record available.
Inventors
- 👤 Donald L Graham
- 👤 Robert N Kennedy
- 👤 Earle L Kropscott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; C08J9/22; C08J9/228; C08J9/236; C08J2363/00; Y; Y10; Y10S; Y10S138/00; Y10S138/09; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1376; Y10T428/23; Y10T428/233; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/24999
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
METHOD FOR EXPANDING INTO A FOAM STRUCTURE AN EXPANDABLE GRANDULAR THERMOPLSTIC RESINOUS MATERIAL CONTAINING A BLOWING AGENT INCORPORATED IN ITS DISCRETE PARTICLES WHICH COMPRISES MIXING WITH AN UNFOAMED MASS OF THE THERMOPLSATIC RESINOUS MATERIAL A QUANTITY OF A SELF-REACTING EXOTHERMUS SUBSTANCE WHICH IS INERT TO THE EXPANDABLE THERMOPLSATIC RESINOUS MATERIAL IN AN AMOUNT ADEQUATE UPON SELF-REACTION TO GENERATE SUFFICIENT HEAT TO RAISE THE TEMPERATURE OF THE UNFOAMED MASS TO A FOAMING TEMPERATURE WITHOUT THERMAL DEGRADATION THEREOF AND REACTING WITHOUT EXOTHERMUS SUBSTANCE TO GENERATE SUFFICIENT HEAT WITHIN THE MASS TO SOFTEN THE MASS AND CASUE EXPANSION OF THE BLOWING AGENT IN THE DISTNACE PARTICLES IN THE MASS TO EXPAND THE MASS TO A FOAM STRUCTURE.
Claim 2
Dependent Claim
114 words
METHOD FOR EXPANDING INTO A FOAM STRUCTURE AN EXPANDABLE GRANDULAR THERMOPLSTIC RESINOUS MATERIAL CONTAINING A BLOWING AGENT INCORPORATED IN ITS DISCRETE PARTICLES WHICH COMPRISES MIXING WITH AN UNFOAMED MASS OF THE THERMOPLSATIC RESINOUS MATERIAL A QUANTITY OF A SELF-REACTING EXOTHERMUS SUBSTANCE WHICH IS INERT TO THE EXPANDABLE THERMOPLSATIC RESINOUS MATERIAL IN AN AMOUNT ADEQUATE UPON SELF-REACTION TO GENERATE SUFFICIENT HEAT TO RAISE THE TEMPERATURE OF THE UNFOAMED MASS TO A FOAMING TEMPERATURE WITHOUT THERMAL DEGRADATION THEREOF AND REACTING WITHOUT EXOTHERMUS SUBSTANCE TO GENERATE SUFFICIENT HEAT WITHIN THE MASS TO SOFTEN THE MASS AND CASUE EXPANSION OF THE BLOWING AGENT IN THE DISTNACE PARTICLES IN THE MASS TO EXPAND THE MASS TO A FOAM STRUCTURE.
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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) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |