US3305533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane polymers having urethane and semi-carbazide groupings
Assignee: Bayer AG
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Filing: 1962-12-21
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Granted: 1967-02-21
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Thoma Wilhelm
- 👤 Rinke Heinrich
- 👤 Oertel Harald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:33
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE POLYMERS WHICH COMPRISES REACTING (1) A SUBSTANTIALLY LINEAR NCO TERMINATED POLYURETHANE PREPOLYMER PREPARED BY REACTING (A) AN ORGANIC COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 5000 AND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS AND SELECTED FROM THE GROUP CONSISTING OF HYDROXY POLYESTERS, POLYESTER AMIDES, POLYALKYLENE ETHERS, POLYTHIOETHERS, POLYACETALS, AND HYDROXY-TERMINATED POLYCARBONATES, WITH (B) AN EXCESS OF AN ORGANIC DIISOCYANATE WITH (2) FROM ABOUT 10 TO ABOUT 90 EQUIVALENT PERCENT OF A POLYHYDRIC ALCOHOL TO FORM A POLYURETHANE INTERMEDIATE AND REACTING SAID POLYURETHANE INTERMEDIATE WITH (3) FROM ABOUT 90 TO ABOUT 110 EQUIVALENT PERCENT BASED ON THE REMAINING NCO CONTENT OF SAID INTERMEDIATE WITH A HYDRAZIDE HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE POLYMERS WHICH COMPRISES REACTING (1) A SUBSTANTIALLY LINEAR NCO TERMINATED POLYURETHANE PREPOLYMER PREPARED BY REACTING (A) AN ORGANIC COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 5000 AND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS AND SELECTED FROM THE GROUP CONSISTING OF HYDROXY POLYESTERS, POLYESTER AMIDES, POLYALKYLENE ETHERS, POLYTHIOETHERS, POLYACETALS, AND HYDROXY-TERMINATED POLYCARBONATES, WITH (B) AN EXCESS OF AN ORGANIC DIISOCYANATE WITH (2) FROM ABOUT 10 TO ABOUT 90 EQUIVALENT PERCENT OF A POLYHYDRIC ALCOHOL TO FORM A POLYURETHANE INTERMEDIATE AND REACTING SAID POLYURETHANE INTERMEDIATE WITH (3) FROM ABOUT 90 TO ABOUT 110 EQUIVALENT PERCENT BASED ON THE REMAINING NCO CONTENT OF SAID INTERMEDIATE WITH A HYDRAZIDE HAVING A FORMULA 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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |