Patent US2950307A successfully refreshed from Google Patents.
US2950307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanate compositions
Assignee: —
•
Filing: —
•
Granted: 1960-08-23
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Expires: 1977-08-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:07
CPC Classifications
—
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
POLYISOCYANATE COMPOSITIONS OF REDUCED TENDENCY TO DISCOLOUR CONSISTING ESSENTIALLY OF AT LEAST ONE POLYISOCYANATE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC, CYCLOALIPHATIC AND AROMATIC DI- AND TRI-ISOCYANATES AND AT LEAST ONE PHENOL CONTAINING AT LEAST ONE RADICAL SELECTED FROM THE GROUP CONSISTING OF TERTIARY ALKYL AND A-ALKYLCYCLOALKYL RADICALS HAVING FROM 4 TO 8 CARBON ATOMS, THE PROPORTION OF PHENOL IN THE COMPOSITION BEING FROM 0.1% TO 5% BY WEIGHT OF THE POLYISOCYANATE.
Claim 2
Dependent Claim
72 words
POLYISOCYANATE COMPOSITIONS OF REDUCED TENDENCY TO DISCOLOUR CONSISTING ESSENTIALLY OF AT LEAST ONE POLYISOCYANATE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC, CYCLOALIPHATIC AND AROMATIC DI- AND TRI-ISOCYANATES AND AT LEAST ONE PHENOL CONTAINING AT LEAST ONE RADICAL SELECTED FROM THE GROUP CONSISTING OF TERTIARY ALKYL AND A-ALKYLCYCLOALKYL RADICALS HAVING FROM 4 TO 8 CARBON ATOMS, THE PROPORTION OF PHENOL IN THE COMPOSITION BEING FROM 0.1% TO 5% BY WEIGHT OF THE POLYISOCYANATE.
References Cited (Backward Citations)
US2086418A
Cited
US2573779A
Cited
US2437867A
Cited
US2476779A
Cited
US2589979A
Cited
US2591651A
Cited
US2729666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |