Patent US3297597A successfully refreshed from Google Patents.
US3297597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of rigid polyurethane foam
Assignee: Texaco Inc
•
Filing: 1966-05-23
•
Granted: 1967-01-10
•
Expires: 1986-05-23
Abstract
No abstract record available.
Inventors
- 👤 Gayle D Edwards
- 👤 Doris M Rice
- 👤 Robert L Soulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G14/00; C08G14/02; C08G14/04; C08G14/12; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G18/54; C08G18/546; C08G65/00; C08G65/02; C08G65/26; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2150/00; C08G2150/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A METHOD FOR PREPARING A RIGID POLYURETHANE FOAM WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH A POLYOL COMPONENT COMPRISING FROM ABOUT 30 TO 100 WT. PERCENT OF A NITROGEN-CONTAINING POLYOL HAVING A HYDROXYL NUMBER OF FROM ABOUT 250 TO ABOUT 900 AND A NITROGEN CONTENT OF FROM ABOUT 1 TO ABOUT 15 WT. PERCENT AND, CORRESPONDINGLY, FROM ABOUT 70 TO 0 WT. PERCENT OF A SECOND POLYOL, SAID NITROGEN-CONTAINING POLYOL HAVING BEEN PREPARED BY A METHOD WHICH COMPRISES THE STEPS OF: (1) MIXING A PHENOL AND AN ALKANOLAMINE SELECTED FROM THE GROUP CONSISTING OF ALKANOLAMINES HAVING THE FORMULAE:
Claim 2
Independent Claim
98 words
A METHOD FOR PREPARING A RIGID POLYURETHANE FOAM WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH A POLYOL COMPONENT COMPRISING FROM ABOUT 30 TO 100 WT. PERCENT OF A NITROGEN-CONTAINING POLYOL HAVING A HYDROXYL NUMBER OF FROM ABOUT 250 TO ABOUT 900 AND A NITROGEN CONTENT OF FROM ABOUT 1 TO ABOUT 15 WT. PERCENT AND, CORRESPONDINGLY, FROM ABOUT 70 TO 0 WT. PERCENT OF A SECOND POLYOL, SAID NITROGEN-CONTAINING POLYOL HAVING BEEN PREPARED BY A METHOD WHICH COMPRISES THE STEPS OF: (1) MIXING A PHENOL AND AN ALKANOLAMINE SELECTED FROM THE GROUP CONSISTING OF ALKANOLAMINES HAVING THE FORMULAE:
Claim 3
Dependent Claim
9 words
A PRODUCT PREPARED BY THE METHOD OF CLAIM 1.
References Cited (Backward Citations)
USRE24514E
Cited
US2953533A
Cited
US2956031A
Cited
GB972772A
Cited
US3075927A
Cited
US3222305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |