Patent US3793237A successfully refreshed from Google Patents.
US3793237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open-cell rigid polyether polyurethane foam
Assignee: Union Carbide Corp
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Filing: 1972-08-11
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Granted: 1974-02-19
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Expires: 1992-08-11
Abstract
Abstract PROCESS FOR THE PRODUCTION OF OPEN-CELL RIGID POLYETHER POLYURETHANE FOAM EMPOLYING AS THE CELL-OPENING AGENT A SILOANE-OXYALKYLENE (AB)N BLOCK COPOLYMER AND THE CURED FOAMS PRODUCED THEREBY.
Inventors
- 👤 J Watkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2350/00; C08J2375/00; C08J2375/04; C08J2375/08; C08J2483/00; Y; Y10; Y10S; Y10S521/00; Y10S521/906
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |