Patent US3211677A successfully refreshed from Google Patents.
US3211677A
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US
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Vinyl chloride polymer foams by treatment with a bis (azidoformate) modifying agent and a blowing agent
Assignee: Hercules Powder Co
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Filing: 1963-07-22
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Granted: 1965-10-12
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Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 George B Feild
- 👤 John R Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2423/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR PREPARING A MODIFIED CELLULAR VINYL CHLORIDE POLYMER MATERIAL WHICH COMPRISES HEATING A BLEND OF A VINYL CHLORIDE POLYMER WITH A BLOWING AGENT AND AN AZIDOFORMATE HAVING A BOILING POINT OF AT LEAST ABOUT 100*C. AT A PRESSURE OF 70 MM. OF MERCURY AND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
50 words
A PROCESS FOR PREPARING A MODIFIED CELLULAR VINYL CHLORIDE POLYMER MATERIAL WHICH COMPRISES HEATING A BLEND OF A VINYL CHLORIDE POLYMER WITH A BLOWING AGENT AND AN AZIDOFORMATE HAVING A BOILING POINT OF AT LEAST ABOUT 100*C. AT A PRESSURE OF 70 MM. OF MERCURY AND HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |