US3882094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of rubbers
Assignee: Bridgestone Firestone Inc
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Filing: 1973-10-29
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Granted: 1975-05-06
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Expires: 1993-10-29
Abstract
Abstract The invention relates to the hydrogenation of a rubber in the presence of a catalyst which is the reaction product of Co(Py)2Cl2 (a complex of pyridine and cobaltous chloride) and trialkyl aluminum or dialkyl aluminum hydride.
Inventors
- 👤 Adel Farhan Halasa
- 👤 Richard Gutierrez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:41
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/14; B01J31/143; B01J31/16; B01J31/18; B01J31/1805; B01J31/181; C; C07; C07F; C07F5/00; C07F5/06; C08; C08C; C08C19/00; C08C19/02; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645; B01J2531/00; B01J2531/02; B01J2531/0202; B01J2531/0211; B01J2531/80; B01J2531/84; B01J2531/845
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
The process of claim 1 in which the rubber contains only aliphatic groups, the temperature is 0* C. to 80* C. and the pressure is 25 to 500 psig.
Claim 2
Dependent Claim
28 words
The process of claim 1 in which the rubber contains aromatic groups, the temperature is 0* C. to 100* C. and the pressure is 500 to 15,000 psig.
Claim 3
Dependent Claim
18 words
The process of claim 1 in which the rubber is a polymer with an alkali metal terminal group.
References Cited (Backward Citations)
US3766300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |