Patent US3814699A successfully refreshed from Google Patents.
US3814699A
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Solutions for the treatment of amorphous carbon or graphite manufactured articles for improving their resistance to oxidation
Assignee: SnamProgetti SpA
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Filing: 1971-01-22
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Granted: 1974-06-04
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Expires: 1991-01-22
Abstract
Abstract THIS INVENTION PROVIDED A SOLUTION AND NOVEL PROCEDURE FOR IMPARTING OXIDATION RESISTANCE TO AMORPHOUS CARBON OR GRAPHITE MANUFACTURED ARTICLES BY MEANS OF THE COATING SOLUTION WHICH CONSISTS OF WATER, PHOSPHORIC ACID, ONE OR MORE COMPOUNDS SELECTED FROM THE GROUPS OF SALTS, OXIDES AND HYDROXIDES OF A METAL OF THE 2ND GROUP OF THE PERIODIC SYSTEM; ONE OR BOTH COMPONENTS OF THE GROUP FORMED BY BORIC AND SOLDIUM TETRABORATE DECAHYDRATE AND ONE OR MORE COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, SODIUM NITRITE AND SODIUM CARBONATE.
Inventors
- 👤 F Baldieri
- 👤 C Borgianni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:45
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B01; B01J; B01J2/00; B01J2/30; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; H; H01; H01B; H01B1/00; H01B1/04; H05; H05B; H05B7/00; H05B7/02; H05B7/12
Claims Analysis
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |