US3968313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment
Assignee: Individual
•
Filing: 1973-12-27
•
Granted: 1976-07-06
•
Expires: 1993-12-27
Abstract
Abstract Treatment of metals, and other surfaces, with dilute colloidal slightly acidic dispersion of silica and tannin. The treating composition is removed from the metal surface before forming any deposit of silica visible to the naked eye. The metals become resistant to chemical attack.
Inventors
- 👤 Martin B. Pearlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0201; B01J37/0205; B01J33/00; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/53; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
Process for treating metal surfaces to improve their resistance to chemical attack which comprises bringing said surfaces into contact with an aqueous composition consisting essentially of a colloidal disperison of silica and tannin and removing said metal surface from contact with said composition before any deposit of silica visible to the naked eye is formed on said surface.
Claim 2
Dependent Claim
58 words
Process for treating metal surfaces to improve their resistance to chemical attack which comprises bringing said surfaces into contact with an aqueous composition consisting essentially of a colloidal disperison of silica and tannin and removing said metal surface from contact with said composition before any deposit of silica visible to the naked eye is formed on said surface.
Claim 3
Dependent Claim
13 words
Process as in claim 1 in which said composition also contains a surfactant.
Claim 4
Dependent Claim
17 words
Process as in claim 1 in which the period of said contact is less than an hour.
Claim 5
Dependent Claim
19 words
Process as in claim 1 in which the concentration of silica in said dispersion is up to about 0.04%.
Claim 6
Dependent Claim
14 words
Process as in claim 1 in which said composition contains dissolved sucrose and saponin.
Claim 7
Dependent Claim
12 words
Process as in claim 1 in which said composition also contains saponin.
Claim 8
Dependent Claim
15 words
Process as in claim 6 in which said composition contains water extract of quillaja bark.
Claim 9
Dependent Claim
17 words
Process as in claim 1 in which said metal is ferrous metal, zinc, aluminum, copper and silver.
Claim 10
Dependent Claim
13 words
Product of the process of claim 8, said product having a hydrophobic surface.
Claim 11
Dependent Claim
7 words
Product of the process of claim 1.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |