US3098831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded polyethylene and method of making the same
Assignee: Uniroyal Inc
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Filing: 1959-05-01
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Granted: 1963-07-23
•
Expires: 1979-05-01
Abstract
No abstract record available.
Inventors
- 👤 Clide I Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:14
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/64; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE PROCESS WHICH COMPRISES SUBJECTING A SOLID POLYETHYLENE MATERIAL CONTAINING (1) AN EFFECTIVE AMOUNT OF AN ORGANIC PEROXIDE HAVING A HALF-LIFE OF MORE THAN 5 MINUTES AT 227*F. AND LESS THAN ONE HOUR AT 375*F., AND (2) A SOLID RUBBER BLOWING AGENT WHICH DECOMPOSES WITH LIBERATION OF GAS AT A TEMPERATURE OF ABOUT 300* TO 700* F., TO A TEMPERATURE AT WHICH THE POLYETHYLENE BECOMES STRUCTURALLY TRANSFORMED SO THAT AT LEAST 10% OF THE POLYETHYLENE IS INSOLUBLE WHEN MAINTAINED IN TOLUENE AT 100* C. FOR 24 HOURS AND BELOW THAT AT WHICH SIGNIFICANT DECOMPOSITION OF THE BLOWING AGENT OCCURS, AND THEN SUBJECTING THE TRANSFORMED PRODUCT TO A HIGHER TEMPRATURE AT WHICH THE BLOWING AGENT DECOMPOSES AND THEREBY CAUSING THE POLYETHYLENE TO EXPAND.
Claim 2
Dependent Claim
122 words
THE PROCESS WHICH COMPRISES SUBJECTING A SOLID POLYETHYLENE MATERIAL CONTAINING (1) AN EFFECTIVE AMOUNT OF AN ORGANIC PEROXIDE HAVING A HALF-LIFE OF MORE THAN 5 MINUTES AT 227*F. AND LESS THAN ONE HOUR AT 375*F., AND (2) A SOLID RUBBER BLOWING AGENT WHICH DECOMPOSES WITH LIBERATION OF GAS AT A TEMPERATURE OF ABOUT 300* TO 700* F., TO A TEMPERATURE AT WHICH THE POLYETHYLENE BECOMES STRUCTURALLY TRANSFORMED SO THAT AT LEAST 10% OF THE POLYETHYLENE IS INSOLUBLE WHEN MAINTAINED IN TOLUENE AT 100* C. FOR 24 HOURS AND BELOW THAT AT WHICH SIGNIFICANT DECOMPOSITION OF THE BLOWING AGENT OCCURS, AND THEN SUBJECTING THE TRANSFORMED PRODUCT TO A HIGHER TEMPRATURE AT WHICH THE BLOWING AGENT DECOMPOSES AND THEREBY CAUSING THE POLYETHYLENE TO EXPAND.
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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |