US2901446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing rigid expanded polyvinyl chloride
Assignee: Fisons Industrial Chemicals Ltd
•
Filing: 1957-02-11
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Granted: 1959-08-25
•
Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Hawkins John Gilmour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR PRODUCING REGID EXPANDED POLYVINYL CHLORIDE WHICH COMPRISES THE STEPS OF ADMIXING POLYVINYL CHLORIDE WITH A CHEMICAL BLOWING AGENT AND A HALOGENATED HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF 1:1:2:2-TETRACHLOROETHANE, 1:11:2-TETRACHLOROETHANE AND TETRACHLOROETHYLENE, HEATING THIS MIXTURE UNDER PRESSURE TO DECOMPOSE THE CHEMICAL BLOWING AGENT AND THEREAFTER REHEATING THE PRODUCT TO EFFECT EXPANSION.
Claim 2
Dependent Claim
54 words
A PROCESS FOR PRODUCING REGID EXPANDED POLYVINYL CHLORIDE WHICH COMPRISES THE STEPS OF ADMIXING POLYVINYL CHLORIDE WITH A CHEMICAL BLOWING AGENT AND A HALOGENATED HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF 1:1:2:2-TETRACHLOROETHANE, 1:11:2-TETRACHLOROETHANE AND TETRACHLOROETHYLENE, HEATING THIS MIXTURE UNDER PRESSURE TO DECOMPOSE THE CHEMICAL BLOWING AGENT AND THEREAFTER REHEATING THE PRODUCT TO EFFECT EXPANSION.
References Cited (Backward Citations)
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US2525880A
Cited
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |