US3320082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidal silica protective coating and method of making same
Assignee: American Pipe and Construction Co
•
Filing: 1963-01-30
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Granted: 1967-05-16
•
Expires: 1983-01-30
Abstract
No abstract record available.
Inventors
- 👤 Mcmahon Walter Michael
- 👤 Gabriel H Law
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:10
CPC Classifications
C; C09; C09D; C09D1/00; C09D1/02; C09D1/04; C04; C04B; C04B24/00; C04B24/12; C04B28/00; C04B28/24; C09D5/00; C09D5/08; C09D5/10; C09D5/106; C04B2111/00; C04B2111/00474; C04B2111/00482
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROTECTIVE COATING COMPOSITION WHICH UPON APPLICATION CONVERTS UNDER AMBIENT TEMPERATURE CONDITIONS TO A HARD, WATER INSOLUBLE FILM, SAID COMPOSITION CONSISTING ESSENTIALLY OF A DISPERSION OF AN ALKALI-STABILIZED COLLOIDAL SILICA IN SUFFICIENT WATER TO GIVE THE COMPOSITION THE FLUIDITY REQUIRED FOR APPLICATION, ZINC DUST IN AN AMOUNT RANGING BETWEEN ABOUT 8 AND 15 PARTS ZINC DUST PER PART DRY COLLOIDAL SILICA, LEAD OXIDE IN AN AMOUNT UP TO ABOUT 25% BY WEIGHT OF THE AMOUNT OF ZINC DUST USED, A WATER MISCIBLE ORGANIC AMINE HAVING A BOILING POINT UP TO 360*C. IN AN AMOUNT EQUAL TO AT LEAST 10% AND NOT MORE THAN 50% BY WEIGHT OF THE DRY COLLOIDAL SILICA, AND AN ALKALI METAL CHROMATE IN AN AMOUNT UP TO 0.02 PART PER PART OF DRY COLLOIDAL SILICA.
Claim 2
Dependent Claim
129 words
A PROTECTIVE COATING COMPOSITION WHICH UPON APPLICATION CONVERTS UNDER AMBIENT TEMPERATURE CONDITIONS TO A HARD, WATER INSOLUBLE FILM, SAID COMPOSITION CONSISTING ESSENTIALLY OF A DISPERSION OF AN ALKALI-STABILIZED COLLOIDAL SILICA IN SUFFICIENT WATER TO GIVE THE COMPOSITION THE FLUIDITY REQUIRED FOR APPLICATION, ZINC DUST IN AN AMOUNT RANGING BETWEEN ABOUT 8 AND 15 PARTS ZINC DUST PER PART DRY COLLOIDAL SILICA, LEAD OXIDE IN AN AMOUNT UP TO ABOUT 25% BY WEIGHT OF THE AMOUNT OF ZINC DUST USED, A WATER MISCIBLE ORGANIC AMINE HAVING A BOILING POINT UP TO 360*C. IN AN AMOUNT EQUAL TO AT LEAST 10% AND NOT MORE THAN 50% BY WEIGHT OF THE DRY COLLOIDAL SILICA, AND AN ALKALI METAL CHROMATE IN AN AMOUNT UP TO 0.02 PART PER PART OF DRY COLLOIDAL SILICA.
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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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |