Patent US4526834A successfully refreshed from Google Patents.
US4526834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear graphite
Assignee: Graftech Technology LLC
•
Filing: 1983-12-19
•
Granted: 1985-07-02
•
Expires: 2003-12-19
Abstract
Abstract A high strength, high coefficient of thermal expansion fine-grained isotropic graphite article produced from 30% to 70% of attritor milled gilsonite coke or other high CTE carbon filler particles and minor amounts of a binder such a coal tar pitch and petroleum pitch, the article being formed by warm isostatic molding at a temperature of between 50° C. and 70° C. under a pressure between 100 and 1000 psi for a time between 1 and 10 minutes. The particle size of the fillers ranges up to 150 microns.
Inventors
- 👤 Robert A. Mercuri
- 👤 John M. Criscione
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:44
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/26; Y10T428/268; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A high strength, high coefficient of thermal expansion, fine-grained isotropic graphite article produced by mixing a high coefficient-of-thermal-expansion, attritor milled isotropic carbon flour with a binder, said flour comprising 30 to 70 weight percent of the mixture and having a particle size up to 75 microns, said binder being selected from the group consisting of coal tar pitches and petroelum pitches; isostatically molding the mixture at elevated temperature; and graphitizing the molded mixture.
Claim 2
Dependent Claim
73 words
A high strength, high coefficient of thermal expansion, fine-grained isotropic graphite article produced by mixing a high coefficient-of-thermal-expansion, attritor milled isotropic carbon flour with a binder, said flour comprising 30 to 70 weight percent of the mixture and having a particle size up to 75 microns, said binder being selected from the group consisting of coal tar pitches and petroelum pitches; isostatically molding the mixture at elevated temperature; and graphitizing the molded mixture.
Claim 3
Dependent Claim
12 words
The article of claim 1 wherein said flour is gilsonite coke flour.
Claim 4
Dependent Claim
33 words
The article of claim 2 wherein said isostatic molding is performed at temperature between 50° C. and 70° C. and at pressure between 100 and 1000 psi for from one to ten minutes.
References Cited (Backward Citations)
US3393085A
Cited
US4332856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |