Patent US3219634A successfully refreshed from Google Patents.
US3219634A
Expired / Lapsed
US
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Polyurethanes based upon a polyepichlorohydrin polyol
Assignee: Dunlop Rubber Co Ltd
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Filing: 1961-03-08
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Granted: 1965-11-23
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Expires: 1981-03-08
Abstract
No abstract record available.
Inventors
- 👤 Watson John William
- 👤 Pounder Donald Whitworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5051; C08G18/5003; C08G18/5006; C08G18/5009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD FOR THE PREPARATION OF A SOLID POLYURETHANE WHICH COMPRISES MIXING A POLYURETHANE PREPOLYMER CONTAINING AT LEAST TWO ISOCYANATO END GROUPS COMPRISING THE REACTION PRODUCT OF POLYEPICHLORHYDRIN POLYOL FREE OF EPOXY GROUPS HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 900 CONTAINING AT LEAST TWO TERMINAL HYDROXY GROUPS AND IN WHICH THE REPEATING MONOMER UNIT HAS THE GENERAL FORMULA -CH(CH2CL)CH2O-, AND THE ORGANIC DIISOCYANATE, WITH A CROSS-LINKING AGENT FOR THE SAID PREPOLYMER SELECTED FROM THE CLASS CONSISTING OF WATER, GLYCOLS AND POLYHYDRIC ALCOHOLS, AND ALLOWING THE POLYURETHANE PREPOLYMER TO BECOME CROSS-LINKED.
Claim 2
Independent Claim
92 words
A METHOD FOR THE PREPARATION OF A SOLID POLYURETHANE WHICH COMPRISES MIXING A POLYURETHANE PREPOLYMER CONTAINING AT LEAST TWO ISOCYANATO END GROUPS COMPRISING THE REACTION PRODUCT OF POLYEPICHLORHYDRIN POLYOL FREE OF EPOXY GROUPS HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 900 CONTAINING AT LEAST TWO TERMINAL HYDROXY GROUPS AND IN WHICH THE REPEATING MONOMER UNIT HAS THE GENERAL FORMULA -CH(CH2CL)CH2O-, AND THE ORGANIC DIISOCYANATE, WITH A CROSS-LINKING AGENT FOR THE SAID PREPOLYMER SELECTED FROM THE CLASS CONSISTING OF WATER, GLYCOLS AND POLYHYDRIC ALCOHOLS, AND ALLOWING THE POLYURETHANE PREPOLYMER TO BECOME CROSS-LINKED.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |