US3719452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonaceous material and method of preparation
Assignee: Boeing North American Inc
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Filing: 1969-12-01
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Granted: 1973-03-06
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Expires: 1989-12-01
Abstract
Abstract A relatively pure carbonaceous material formed by compacting polyphenylene and pyrolyzing the compacted matter. The polyphenylene can be mixed with filler material to produce heterogeneous carbonaceous structures. If the filler is silicon in a stoichiometric ratio to the carbon, silicon carbide is produced by the pyrolization.
Inventors
- 👤 O Accountius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:14
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
A process for preparing a relatively pure carbonaceous material comprising compacting particulate polyphenylene at a pressure of at least 1,000 psi to form a solid coherent mass and pyrolyzing the compacted polyphenylene mass in an inert atmosphere at a temperature in the range of 625* to 2500*C.
Claim 2
Dependent Claim
47 words
A process for preparing a relatively pure carbonaceous material comprising compacting particulate polyphenylene at a pressure of at least 1,000 psi to form a solid coherent mass and pyrolyzing the compacted polyphenylene mass in an inert atmosphere at a temperature in the range of 625* to 2500*C.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the polyphenylene is compacted at a pressure between 1,000 and 120,000 psi.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the compacted polyphenylene mass is pyrolyzed at a temperature between 1,000* and 2,500*C.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the polyphenylene is substituted by halogen atoms.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the polyphenylene is parapolyphenylene.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |