Patent US3215645A successfully refreshed from Google Patents.
US3215645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyurethane foams
Assignee: Wyeth Holdings LLC
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Filing: 1961-08-23
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Granted: 1965-11-02
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Expires: 1981-08-23
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1858; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE FOAMS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH A REACTIVE ORGANIC POLYFUNCTIONAL POLYOL CONTAINING A PLURALITY OF ISOCYANATE-REACTIVE HYDROXYL GROUPS IN THE PRESENCE OF A GAS-GENERATING AGENT AND A CATALYTIC AMOUNT OF 1,1,2,4,4,5,5-HEPTAMETHYLBIGUANIDE.
Claim 2
Dependent Claim
40 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE FOAMS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH A REACTIVE ORGANIC POLYFUNCTIONAL POLYOL CONTAINING A PLURALITY OF ISOCYANATE-REACTIVE HYDROXYL GROUPS IN THE PRESENCE OF A GAS-GENERATING AGENT AND A CATALYTIC AMOUNT OF 1,1,2,4,4,5,5-HEPTAMETHYLBIGUANIDE.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |