US3628984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of heat-resistant carbonaceous products having low permeability
Assignee: Nippon Carbon Co Ltd
•
Filing: 1969-03-10
•
Granted: 1971-12-21
•
Expires: 1989-03-10
Abstract
Abstract Two catalytic additives are added to a mixed solution of acetone and furfural to produce a resinous solution for use in impregnating a carbonaceous product. A carbonaceous article is impregnated with the solution at a reduced pressure, and the article is immersed in a concentrated sulfuric acid bath. Then, it is withdrawn from the acid bath, rinsed, and dried. Finally, it is subjected to a heat treatment at elevated temperatures to carbonize or graphitize the carbon product impregnated with the resinous solution.
Inventors
- 👤 Toshikatsu Ishikawa
- 👤 Haruo Teranishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521; C04B35/71; C04B35/78; C04B35/80; C04B35/83
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A method according to claim 1 in which divinyl benzene or trivinyl benzene is added to the liquid mixture.
Claim 2
Dependent Claim
33 words
A method as claimed in claim 1 in which a gaseous substance selected from the group consisting of oxygen, ozone, and chlorine in place of said acid is blown into said liquid mixture.
Claim 3
Dependent Claim
16 words
A method according to claim 3 in which divinyl benzene is added to the liquid mixture.
Claim 4
Dependent Claim
16 words
A method according to claim 3 in which trivinyl benzene is added to the liquid mixture.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |