US3619430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a metal impregnated carbon product
Assignee: Nippon Carbon Co Ltd
•
Filing: 1969-06-06
•
Granted: 1971-11-09
•
Expires: 1989-06-06
Abstract
Abstract A seal material having an improved wear resistance under a severe rotary and vibration condition at elevated temperatures can be produced by the steps of providing a mass of coke powder with a particle size less than 40 micron, mixing the coke powder and a binder by a mixer of Banbury type, molding the mixture to shape, selecting a product having a bulk density of in the range of 1.68-1.79, impregnating the product with a molten metal, and cooling it to room temperature.
Inventors
- 👤 Toshio Hiratsuka
- 👤 Toyonosuke Kanemaru
- 👤 Hiroshi Yamazoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:09
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A method according to claim 1 wherein those carbonaceous shapes of step (h) which have bulk density of less than 1.58 are subjected to one or more pitch impregnations followed after each pitch impregnation by a baking step so as to increase the bulk density to within 1.68 to 1.79.
Claim 2
Dependent Claim
49 words
A method according to claim 1 wherein those carbonaceous shapes of step (h) which have a bulk density of more than 1.58, but less than 1.68 are subjected to a second baking step with no pitch added so as to increase its bulk density to within 1.68 to 1.79.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein the raw carbonaceous material used in step (a) is coke powder of both coal and petroleum origin.
References Cited (Backward Citations)
US2982671A
Cited
US2929741A
Cited
US2946700A
Cited
US3160519A
Cited
US3288573A
Cited
US3348967A
Cited
US3493423A
Cited
US3342627A
Cited
US3469851A
Cited
US3321727A
Cited
US3436253A
Cited
US3517092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |