US2695427A
Expired / Lapsed
US
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Method of making cellular products from vinylidene chloride copolymers
Assignee: Dow Chemical Co
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Filing: 1952-06-25
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Granted: 1954-11-30
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Expires: 1972-06-25
Abstract
No abstract record available.
Inventors
- 👤 Theodore W Sarge
- 👤 Frank H Justin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C08J2327/00; C08J2327/02; C08J2327/04; Y; Y10; Y10S; Y10S264/00; Y10S264/46; Y10S264/61; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD WHICH COMPRISES FORMING A POWDER MIXTURE OF FROM 1 TO 15 PER CENT OF AN ALKALI METAL BICARBONATE AND CORRESPONDINGLY FROM 99 TO 85 PER CENT BY WEIGHT OF A COPOLYMER OF FROM 25 TO 90 PER CENT VINYLIDENE CHLORIDE AND FROM 75 TO 10 PER CENT VINYL CHLORIDE, AND SUBJECTING SUCH MIXTURE TO A RADIOFREQUENCY FIELD UNTIL THE MIXTURE ATTAINS A TEMPERATURE LESS THAN 200* C. BUT AT LEAST AS HIGH AS THE SOFTENING POINT OF THE COPOLYMER, AND REMOVING THE RESULTING FOAMED PRODUCT FROM THE FIELD BEFORE THE COPOLYMER CHARS.
Claim 2
Independent Claim
94 words
THE METHOD WHICH COMPRISES FORMING A POWDER MIXTURE OF FROM 1 TO 15 PER CENT OF AN ALKALI METAL BICARBONATE AND CORRESPONDINGLY FROM 99 TO 85 PER CENT BY WEIGHT OF A COPOLYMER OF FROM 25 TO 90 PER CENT VINYLIDENE CHLORIDE AND FROM 75 TO 10 PER CENT VINYL CHLORIDE, AND SUBJECTING SUCH MIXTURE TO A RADIOFREQUENCY FIELD UNTIL THE MIXTURE ATTAINS A TEMPERATURE LESS THAN 200* C. BUT AT LEAST AS HIGH AS THE SOFTENING POINT OF THE COPOLYMER, AND REMOVING THE RESULTING FOAMED PRODUCT FROM THE FIELD BEFORE THE COPOLYMER CHARS.
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) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |