US3300420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam resins prepared from aromatic anhydrides and isocyanates
Assignee: Standard Oil Co
•
Filing: 1966-02-23
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Granted: 1967-01-24
•
Expires: 1986-02-23
Abstract
No abstract record available.
Inventors
- 👤 Horst E Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:16
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G73/14; C08G2110/00; C08G2110/0041; C08G2110/005; C08G2110/0058
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR PRODUCING A THERMALLY STABLE AND CHEMICALLY INERT RESIN CAPABLE OF SELF-FORMING WHICH COMPRISES REACTING, IN THE LIQUID PHASE, AT ELEVATED TEMPERATURE (I) AN ORGANIC POLYISOCYANATE, AND (2) AN AROMATIC ANHYDRIDE HAVING AT LEAST ONE ADDITIONAL SUBSTITUENT REACTIVE WITH AN ISOCYANATO GROUP SELECTED FROM THE GROUP CONSISTING OF ANHYDRIDE GROUPS AND GROUPS CONTAINING ZERWITINOFF HYDROGENS, IN A RATIO OF ISOCYANATO GROUPS TO MOLES OF SAID ANHYDRIDE OF BETWEEN ABOUT 2:3 TO 6:1.
Claim 2
Dependent Claim
74 words
A PROCESS FOR PRODUCING A THERMALLY STABLE AND CHEMICALLY INERT RESIN CAPABLE OF SELF-FORMING WHICH COMPRISES REACTING, IN THE LIQUID PHASE, AT ELEVATED TEMPERATURE (I) AN ORGANIC POLYISOCYANATE, AND (2) AN AROMATIC ANHYDRIDE HAVING AT LEAST ONE ADDITIONAL SUBSTITUENT REACTIVE WITH AN ISOCYANATO GROUP SELECTED FROM THE GROUP CONSISTING OF ANHYDRIDE GROUPS AND GROUPS CONTAINING ZERWITINOFF HYDROGENS, IN A RATIO OF ISOCYANATO GROUPS TO MOLES OF SAID ANHYDRIDE OF BETWEEN ABOUT 2:3 TO 6:1.
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |