US3660320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry blend polyvinyl chloride foam-forming composition and method
Assignee: Flintkote Co
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Filing: 1969-06-03
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Granted: 1972-05-02
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Expires: 1989-06-03
Abstract
Abstract A PARTICULATE, DRY BLEND VINYL CHLORIDE POLYMER-CONTAINING, FOAM-FORMING COMPOSITION HAVING IMPROVED FOAM-FORMING PROPERTIES IS DISCLOSED. A MIXTURE OF VINYL CHLORIDE POLYMERS HAVING DIFFERENT MOLECULAR WEIGHTS, E.G., RELATIVE VISCOSITIES OF 1.4 TO 2.6 AND A RELATIVE VISCOSITY DIFFERENCE OF 0.003 TO 0.7 IS USED, TO PROVIDE A COMPOSITION THAT IS FOAMABLE OVER A RELATIVELY WIDE RANGE OF HEATING CONDITIONS TO PROVIDE A GREATER DEGREE A LATITUDE IN ACHIEVEING DESIRED COMBINATIONS OF CELL STRUCTURE AND PHYSICAL PROPERTIES OF THE CELLULAR MATERIAL.
Inventors
- 👤 Murdoch L Johnson
- 👤 Francis J W Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2427/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |