US2638460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butadiene polymers as elastomer additives
Assignee: Phillips Petroleum Co
•
Filing: 1951-01-02
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Granted: 1953-05-12
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Expires: 1971-01-02
Abstract
No abstract record available.
Inventors
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A RUBBER-LIKE, SULFUR VULCANIZABLE COMPOSITION COMPRISING A RUBBER-LIKE VULCANIZABLE ORGANIC ELASTOMER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC POLYMERS OF CONJUGATED DIOLEFINS; AND A LIQUID POLYMER PREPARED FROM MONOMERS CONSISTING OF A 1,3BUTADIENE SELECTED FROM THE GROUP CONSISTING OF 1,3-BUTADIENE AND 2-METHYL-1,3-BUTADIENE, SAID LIQUID POLYMER BEING PREPARED BY MASS POLYMERIZATION IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS AND ALKALI METAL HYDRIDES IN AN AMOUNT NOT EXCEEDING TWO PARTS BY WEIGHT OF THE TOTAL MONOMERS CHARGED AND HAVING A PARTICLE SIZE LESS THAN 200 MICRONS AT A TEMPERATURE IN THE RANGE FROM 60 TO 110* C.
References Cited (Backward Citations)
GB492998A
Cited
US2521361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |