US4146401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite material having compressibility and recovering property and method for manufacturing the same
Assignee: Resonac Corp
•
Filing: 1976-07-29
•
Granted: 1979-03-27
•
Expires: 1996-07-29
Abstract
Abstract Acid-treated and water-washed graphite particles are further treated with an aqueous solution of a phosphoric acid or a salt thereof, the expanded by heating to 20 to 70 times (in terms of bulk density ratio) the original graphite particles and the expanded particles are pressure-molded to obtain a graphite material having compressibility and recovering property and suitable for use in making those gaskets, packings, heat insulators, and cushion elements which are resistant to oxidation and serviceable at high temperatures.
Inventors
- 👤 Kazuo Yamada
- 👤 Yasuo Nakano
- 👤 Yoshikatsu Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A method for manufacturing a graphite material having compressibility and a recovering property, which comprises treating particles consisting of graphite with an acid, washing the acid-treated graphite particles with water or an aqueous medium, treating the washed graphite particles with a binder consisting essentially of an aqueous solution of aluminum dihydrogen phosphate, expanding the thus treated graphite particles to 20 to 70 times, in terms of bulk density ratio, the original graphite particles by heating, and molding the expanded graphite particles under the application of pressure.
Claim 2
Independent Claim
86 words
A method for manufacturing a graphite material having compressibility and a recovering property, which comprises treating particles consisting of graphite with an acid, washing the acid-treated graphite particles with water or an aqueous medium, treating the washed graphite particles with a binder consisting essentially of an aqueous solution of aluminum dihydrogen phosphate, expanding the thus treated graphite particles to 20 to 70 times, in terms of bulk density ratio, the original graphite particles by heating, and molding the expanded graphite particles under the application of pressure.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein the molding is carried out under application of a pressure of 50 to 300 kg/cm 2 .
Claim 4
Dependent Claim
17 words
A method according to claim 2, wherein the molding is carried out for 10 to 120 seconds.
Claim 5
Dependent Claim
24 words
A method according to claim 2, wherein the aqueous solution of aluminum dihydrogen phosphate has a concentration of 0.05 to 1.0 mole per liter.
Claim 6
Dependent Claim
27 words
A method according to claim 4, wherein the expansion by heating is carried out at a temperature of 600° to 800° C. for 1 to 3 minutes.
Claim 7
Dependent Claim
25 words
A method according to claim 1, wherein the density of the graphite material having compressibility and recovering property is 0.8 to 1.7 g/cm 3 .
Claim 8
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 1.
Claim 9
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 2.
Claim 10
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 3.
Claim 11
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 4.
Claim 12
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 5.
Claim 13
Dependent Claim
11 words
A graphite material manufactured by the method according to claim 6.
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) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |