Patent US3322880A successfully refreshed from Google Patents.
US3756967A
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US
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Poly (vinyl chloride) homopolymer particles obtained by freeze drying
Assignee: Armstrong World Industries Inc
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Filing: 1971-12-08
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Granted: 1973-09-04
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Expires: 1991-12-08
Abstract
Abstract PARTICLES OF POLY(VINYL CHLORIDE) HOMOPOLYMERS HAVING INCREASED POROSITY ARE OBTAINED BY FREEZE-DRYING SUSPENSION OR BULK POLYMERIZED POLY(VINYL CHLORIDE) HOMOPOLYMER PARTICLES THUS MINIMIZING SIGNIFICANT HEAT HISTORY DURING PARTICLE FORMATION.
Inventors
- 👤 H Liebman
- 👤 S Liebman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08F; C08F8/00; C08F8/18; C08F8/20; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S260/00; Y10S260/22
Claims Analysis
Total Claims: 0
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |