US2929793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making closed cell polyvinyl chloride foam
Assignee: Individual
•
Filing: 1957-07-12
•
Granted: 1960-03-22
•
Expires: 1977-07-12
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Hirsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107; B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF MAKING CLOSED CELL POLYVINYL CHLORIDE FOAM WHICH COMPRIESE MAKING A PLASTISOL BY MIXING POLYVINYL CHLORIDE WITH A PLASTICIZER AND DISTRIBUTING A BLOWING AGENT COMPRISING N,N''-DIMETHYL-N,N''-DIMITROSO TEREPHTHALAMIDE THROUGH THE PLASTISOL, BLOWING THE PLASTISOL TO ITS FINAL EXPANSION BY COMPLETELY DECOMPOSING THE BLOWING AGENT WHILE THE PLASTISOL IS AT ATMOSPHERIC PRESSURE MAINTAINING THE TEMPERATURE OF THE PLASTISOL BELOW THE FUSING TEMPERATURE OF THE POLYVINYL CHLORIDE DURING THE BLOWING STEP, AND THEN RAISING THE TEMPERATURE OF THE RESULTING FOAM QUICKLY TO FUSING TEMPERATURE WHILE MAINTAINING THE CELLS THEREOF CLOSED.
Claim 2
Independent Claim
89 words
THE METHOD OF MAKING CLOSED CELL POLYVINYL CHLORIDE FOAM WHICH COMPRIESE MAKING A PLASTISOL BY MIXING POLYVINYL CHLORIDE WITH A PLASTICIZER AND DISTRIBUTING A BLOWING AGENT COMPRISING N,N''-DIMETHYL-N,N''-DIMITROSO TEREPHTHALAMIDE THROUGH THE PLASTISOL, BLOWING THE PLASTISOL TO ITS FINAL EXPANSION BY COMPLETELY DECOMPOSING THE BLOWING AGENT WHILE THE PLASTISOL IS AT ATMOSPHERIC PRESSURE MAINTAINING THE TEMPERATURE OF THE PLASTISOL BELOW THE FUSING TEMPERATURE OF THE POLYVINYL CHLORIDE DURING THE BLOWING STEP, AND THEN RAISING THE TEMPERATURE OF THE RESULTING FOAM QUICKLY TO FUSING TEMPERATURE WHILE MAINTAINING THE CELLS THEREOF CLOSED.
References Cited (Backward Citations)
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US2525880A
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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) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |