US3196132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic diol chain-extended polyester urethanes
Assignee: Diamond Shamrock Corp
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Filing: 1961-04-20
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Granted: 1965-07-20
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Expires: 1981-04-20
Abstract
No abstract record available.
Inventors
- 👤 Rosen Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE PREPARATION OF A SOLID, CURED POLYURETHANE ELASTOMER COMPRISING HEATING A MIXTURE OF 145155 PARTS BY WEIGHT OF A HYDROXYL-ENDED POLYESTER AND 0.01-0.05 PARTS BY WEIGHT OF CITRIC ACID MONOHYDRATE TO 100-200*C. AT A PRESSURE OF 10-50 MM. OF MERCURY; ADDING 58-62 PARTS BY WEIGHT OF P,P''-DIPHENYLMETHANE DIISOCYANATE; LOWERING THE TEMPERATURE TO 124-131*C., MAINTAINING THE TEMPERATURE AND ADDING 15-40 PARTS BY WEIGHT OF A CHAIN-EXTENDER OF THE FORMULA: HO-R-OH, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE PREPARATION OF A SOLID, CURED POLYURETHANE ELASTOMER COMPRISING HEATING A MIXTURE OF 145155 PARTS BY WEIGHT OF A HYDROXYL-ENDED POLYESTER AND 0.01-0.05 PARTS BY WEIGHT OF CITRIC ACID MONOHYDRATE TO 100-200*C. AT A PRESSURE OF 10-50 MM. OF MERCURY; ADDING 58-62 PARTS BY WEIGHT OF P,P''-DIPHENYLMETHANE DIISOCYANATE; LOWERING THE TEMPERATURE TO 124-131*C., MAINTAINING THE TEMPERATURE AND ADDING 15-40 PARTS BY WEIGHT OF A CHAIN-EXTENDER OF THE FORMULA: HO-R-OH, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |