US4394478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidized carbonaceous materials and vulcanized and vulcanizable rubber compositions reinforced with such carbonaceous materials
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1981-06-29
•
Granted: 1983-07-19
•
Expires: 2001-06-29
Abstract
Abstract Oxidized carbonaceous materials suitable for reinforcing such diene rubbers as styrene-butadiene rubber and natural rubber include carbon, oxidized iron dispersed in, intimately associated with and at least partially bonded to the carbon, and hydrogen.
Inventors
- 👤 Jon W. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:07
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/10; C08K3/11
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A composition comprising a major amount of diene rubber and a minor amount of oxidized carbonaceous material comprising carbon in an amount of about 80% to about 99%; oxidized iron dispersed in, intimately associated with and at least partially bonded to the carbon in an amount of about 1% to about 15%; and hydrogen in an amount of about 0.1% to about 1.5% by weight.
Claim 2
Dependent Claim
65 words
A composition comprising a major amount of diene rubber and a minor amount of oxidized carbonaceous material comprising carbon in an amount of about 80% to about 99%; oxidized iron dispersed in, intimately associated with and at least partially bonded to the carbon in an amount of about 1% to about 15%; and hydrogen in an amount of about 0.1% to about 1.5% by weight.
Claim 3
Dependent Claim
47 words
The composition of claim 1 wherein said diene rubber is styrene-butadiene rubber, said styrene-butadiene rubber comprising an amount of about 90% to about 45% by weight of the composition and the carbonaceous material comprising an amount from about 5% to about 40% by weight of said composition.
Claim 4
Dependent Claim
57 words
The composition of claim 1 wherein said diene rubber is selected from the group consisting of styrene-butadiene rubber, natural rubber amd mixtures thereof, said rubber comprising an amount of about 90% to about 45% by weight of said composition and the carbonaceous material comprising an amount of about 5% to about 40% by weight of said composition.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |