Patent US2905652A successfully refreshed from Google Patents.
US2905652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane rubbers
Assignee: Bridgestone Firestone Inc
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Filing: 1954-12-03
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Granted: 1959-09-22
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Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Chris E Best
- 👤 Walter R Hausch
- 👤 James J Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
PROCESS WHICH COMPRISES HEATING (1) A SUBSTANTIALLY LINER POLYESTER THE MONOMERIC CONSITUENTS OF WHICH CONSIST FO(A) A DICARBOXYLIC ACID WITH (B) A SUBSTANCE SELECTED FROM THE GROUPE CONSISTING OF DIHYDRIC ALCHOLS AND MIXTURES OF DIHYDRIC ALCHOLS WITH UP TO 10% BASED ON THE WEIGHT OF THE POLYESTERS, OF HYDROXY-CARBOXYLIC ACIDS, AND UP TO 2%, BASED ON THE WEIGHT OF POLYSTERS, OF POLYCARBOXYLIC ACIDS AND POLYHYDRIC ALCHOLS HAVING A FUNCTIONALITY GREATER THAN 2, SAID LINEAR POLYESTER HAVING A HYDROXYL NUMBER OF FROM 18 TO 25 AND AN ACID NUMBER LESS THAN 2, WITH (11) 6-10% OF AN ORGANIC DIISOCYANATES SUFFICENT TO CHAIN-EXTEND THE POLYESTER TO PRODUCE AN INTERMEDIATE PRODUCTS (111) RESEMBLING UNVULCANIZED NATURAL RUBBER, AND HEATING THE INTERMEDIATE PRODUCTS (111) WITH (1V) A FURTHE -8-10% OF AN ORGANIC POLYISOCYANATE TO PRODUCE A CURED, ELASTIC, RUBBERY PRODUCT.
Claim 2
Dependent Claim
135 words
PROCESS WHICH COMPRISES HEATING (1) A SUBSTANTIALLY LINER POLYESTER THE MONOMERIC CONSITUENTS OF WHICH CONSIST FO(A) A DICARBOXYLIC ACID WITH (B) A SUBSTANCE SELECTED FROM THE GROUPE CONSISTING OF DIHYDRIC ALCHOLS AND MIXTURES OF DIHYDRIC ALCHOLS WITH UP TO 10% BASED ON THE WEIGHT OF THE POLYESTERS, OF HYDROXY-CARBOXYLIC ACIDS, AND UP TO 2%, BASED ON THE WEIGHT OF POLYSTERS, OF POLYCARBOXYLIC ACIDS AND POLYHYDRIC ALCHOLS HAVING A FUNCTIONALITY GREATER THAN 2, SAID LINEAR POLYESTER HAVING A HYDROXYL NUMBER OF FROM 18 TO 25 AND AN ACID NUMBER LESS THAN 2, WITH (11) 6-10% OF AN ORGANIC DIISOCYANATES SUFFICENT TO CHAIN-EXTEND THE POLYESTER TO PRODUCE AN INTERMEDIATE PRODUCTS (111) RESEMBLING UNVULCANIZED NATURAL RUBBER, AND HEATING THE INTERMEDIATE PRODUCTS (111) WITH (1V) A FURTHE -8-10% OF AN ORGANIC POLYISOCYANATE TO PRODUCE A CURED, ELASTIC, RUBBERY PRODUCT.
References Cited (Backward Citations)
DE878827C
Cited
US2621166A
Cited
US2650212A
Cited
US2625531A
Cited
US2729618A
Cited
US2730518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |