US3634569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of dense graphite structures
Assignee: RTX Corp
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Filing: 1969-01-08
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Granted: 1972-01-11
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Expires: 1989-01-08
Abstract
Abstract THIS DISCLOSURE DESCRIBES A GRAPHITE COMPOSITION AND A FABRICATION PROCEDURE FOR PRODUCING COOLANT AND/OR SUPPORT PLATES FOR ACID FUEL CELLS. THE COMPOSITION CONSISTS OF A GRAPHITE POWDER SIZED PRINCIPALLY IN THE 50 TO 150MICRON RANGE WITH ABOUT 7 PERCENT OF THE GRAPHITE POWDER IN THE RANGE BELOW 50 MICRONS. THE PROCESS INVOLVES A CONTROLLED LOW-PRESSURE HEATING STEP AND AN INTERMEDIATE TEMPERATURE FULL-PRESSURE MOLDING OPERATION. HOMOGENEOUS GRAPHITE STRUCTURES OF HIGH DENSITY WITH IMPROVED STRUCTURAL, THERMAL, AND ELECTRICAL PROPERTIES CAN BY PROVIDED IN A VARIETY OF EXTREMELY INTRICATE SHAPES BY MOLDING.
Inventors
- 👤 Roger C Emanuelson
- 👤 Warren L Luoma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; H; H01; H01M; H01M8/00; H01M8/02; H01M8/0202; H01M8/0204; H01M8/0213; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |