US2761857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stiffening unvulcanized rubber
Assignee: Uniroyal Inc
•
Filing: 1953-04-24
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Granted: 1956-09-04
•
Expires: 1973-04-24
Abstract
No abstract record available.
Inventors
- 👤 Robert R Barnhart
- 👤 Harry D Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/36; C08K5/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD WHICH COMPRISES MILLING INTO AN UNVULCANIZED RUBBER STOCK WHICH IS IN PROCESS AND HAS AN OBJECTIONABLY LOW VISCOSITY FOR SATISFACTORY HANDLING IN FACTORY OPERATIONS, THE RUBBER IN SAID STOCK BEING SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, RUBBERY BUTADIENE-STYRENE COPOLYMERS, RUBBERY BUTADIENE-ACRYLONITRILE COPOLYMERS, AND POLYCHLOROPRENE, A SALT-SELECTED FROM THE GROUP CONSISTING OF DIHYDRAZINE OXALATE AND DIHYDRAZINE SULFATE IN AN AMOUNT CONTAINING FROM 0.01 TO 0.1 PART OF ACTUAL HYDRAZINE PER 100 PARTS OF SAID RUBBER, EXPOSING THE MIXTURE TO A TEMPERATURE RANGING FROM ROOM TEMPERATURE TO A TEMPERATURE JUST BELOW THAT AT WHICH THERMAL INJURY TO SAID RUBBER WOULD OCCUR AND THEREBY CAUSING SAID SALT TO ACT UPON SAID STOCK IN SUCH A WAY AS TO IMPART THERETO A CONSIDERABLY INCREASED SLIFFNESS, AT SOME POINT INCORPORATING IN THE STOCK VULCANIZING AND OTHER CONVENTIONAL COMPOUNDING INGREDIENTS,
Claim 2
Independent Claim
138 words
THE METHOD WHICH COMPRISES MILLING INTO AN UNVULCANIZED RUBBER STOCK WHICH IS IN PROCESS AND HAS AN OBJECTIONABLY LOW VISCOSITY FOR SATISFACTORY HANDLING IN FACTORY OPERATIONS, THE RUBBER IN SAID STOCK BEING SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER, RUBBERY BUTADIENE-STYRENE COPOLYMERS, RUBBERY BUTADIENE-ACRYLONITRILE COPOLYMERS, AND POLYCHLOROPRENE, A SALT-SELECTED FROM THE GROUP CONSISTING OF DIHYDRAZINE OXALATE AND DIHYDRAZINE SULFATE IN AN AMOUNT CONTAINING FROM 0.01 TO 0.1 PART OF ACTUAL HYDRAZINE PER 100 PARTS OF SAID RUBBER, EXPOSING THE MIXTURE TO A TEMPERATURE RANGING FROM ROOM TEMPERATURE TO A TEMPERATURE JUST BELOW THAT AT WHICH THERMAL INJURY TO SAID RUBBER WOULD OCCUR AND THEREBY CAUSING SAID SALT TO ACT UPON SAID STOCK IN SUCH A WAY AS TO IMPART THERETO A CONSIDERABLY INCREASED SLIFFNESS, AT SOME POINT INCORPORATING IN THE STOCK VULCANIZING AND OTHER CONVENTIONAL COMPOUNDING INGREDIENTS,
References Cited (Backward Citations)
US2136373A
Cited
US2315850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |