US2897102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resistant graphite and method for making the same
Assignee: Union Carbide Corp
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Filing: 1957-07-01
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Granted: 1959-07-28
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph C Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:32
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C01; C01B; C01B32/00; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; C04B41/80; C04B41/81; C04B41/85; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A METHOD FOR IMPROVING THE OXIDATION RESISTANCE OF GRAPHITE ARTICLES CONTAINING NOT MORE THAN 0.5 PERCENT IRON, WHICH METHOD COMPRISES SEPUENTIALLY IMPREGNATING SAID ARTICLES AT REDUCED AND INCREASED PRESSURES WITH AN AQUEOUS COLLOIDAL SILICA SOLUTION, DRYING THE TREATED ARTICLE AT ABOUT 100*C., IMPREGNATING THE DRIED ARTICLE WITH PHOSPHORIC ACID SOLUTION, AND DRYING THE ARTICLE, SAID PHOSPHORIC ACID HAVING A TENDENCY TO DISAPPEAR AT THE TEMPERATURES TO WHICH SAID ARTICLE ARE EXPOSED IN NORMAL USE THEREBY BECOMING INEFFECTIVE FOR ITS PURPOSE, SAID SILICA SERVING TO REACT WITH SAID PHOSPHORIC ACID TO FORM A SILICON PHOSPHORUS OXYGEN COMPLEX AT SUCH TEMPERATURES, THUS INHIBITING LOSS OF SAID PHOSPHORIC ACID FROM SAID ARTICLES.
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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |