US2804435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing expanded organic polymeric materials and a blowing agent therefor
Assignee: Fisons Industrial Chemicals Ltd
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Filing: 1954-09-20
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Granted: 1957-08-27
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Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 Ronald A Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08J9/103; Y; Y10; Y10S; Y10S521/00; Y10S521/909; Y10S521/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS WHICH COMPRISES INCORPORATING A GASPRODUCING COMPOSITION COMPRISING A MIXTURE OF AZODICARBONAMIDE AND FROM 1% TO 5% OF BIUREA BASED UPON THE WEIGHT OF THE AZODICARBONAMIDE INTO A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND A PARTIALLY GELLED HOMO-POLYMERIC VINYL CHLORIDE AND HEATING THE RESULTANT MATERIAL TO A TEMPERATURE IN THE RANGE 150* TO 230*C.
Claim 2
Dependent Claim
59 words
A PROCESS WHICH COMPRISES INCORPORATING A GASPRODUCING COMPOSITION COMPRISING A MIXTURE OF AZODICARBONAMIDE AND FROM 1% TO 5% OF BIUREA BASED UPON THE WEIGHT OF THE AZODICARBONAMIDE INTO A POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND A PARTIALLY GELLED HOMO-POLYMERIC VINYL CHLORIDE AND HEATING THE RESULTANT MATERIAL TO A TEMPERATURE IN THE RANGE 150* TO 230*C.
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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |