US2904535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing polyalkyleneether polyurethanes with aromatic dhsocyanates
Assignee: Shell Development Co
•
Filing: 1956-02-27
•
Granted: 1959-09-15
•
Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Mika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A COMPOSITION COMPRISING A THERMOPLASTIC POLYURETHANE HAVING A MOLECULAR WEIGHT OF AT LEASTT ABOUT 10.000 WHICH HAS HAD ADMIXED THEREWITH FROM 0.5 TO 25% BY WEIGHT OF A PHENYLENE DISOCYANATE HAVING A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYL, CYCLOHEXYL AND PHENYL RADICALS ATTACHED AT EACH ORTHO POSITION RELATIVE TO THE ISOCYANATO GROUPS, SAID POLYURETHANE BEING A LINEAR POLYMER COMPRISING ESSENTIALLY STRUCTURAL UNITS OF THE FORMULA
Claim 2
Dependent Claim
68 words
A COMPOSITION COMPRISING A THERMOPLASTIC POLYURETHANE HAVING A MOLECULAR WEIGHT OF AT LEASTT ABOUT 10.000 WHICH HAS HAD ADMIXED THEREWITH FROM 0.5 TO 25% BY WEIGHT OF A PHENYLENE DISOCYANATE HAVING A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYL, CYCLOHEXYL AND PHENYL RADICALS ATTACHED AT EACH ORTHO POSITION RELATIVE TO THE ISOCYANATO GROUPS, SAID POLYURETHANE BEING A LINEAR POLYMER COMPRISING ESSENTIALLY STRUCTURAL UNITS OF THE FORMULA
References Cited (Backward Citations)
CA501126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |