Patent US3796608A successfully refreshed from Google Patents.
US3796608A
Expired / Lapsed
US
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Surface treatment
Assignee: Individual
•
Filing: 1971-05-10
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Granted: 1974-03-12
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Expires: 1991-05-10
Abstract
Abstract TREATMENT OF METALS, AND OTHER SURFACES, WITH DILUTE COLLOIDAL SLIGHTLY ACIDIC DISPERSION OF SILICA. THE METALS BECOME RESISTANT TO CHEMICAL ATTACK.
Inventors
- 👤 M Pearlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:57
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/53; B; B01; B01J; B01J33/00; B01J37/00; B01J37/02; B01J37/0201; B01J37/0205; C09; C09D; C09D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |