US2692838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a silica coating
Assignee: AT&T Inc
•
Filing: 1951-05-26
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Granted: 1954-10-26
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Expires: 1971-05-26
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Thurber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:45
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; H; H01; H01B; H01B1/00; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR PRODUCING A SILICA COATING ON A SOLID BODY COMPRISING FORMING A COLLOIDAL HYDRATED SILICA SOLUTION BY HYDROLYZING AN ALKYL SILICATE IN THE PRESENCE OF AN ACID HYDROLYZING AGENT COMPRISING A DILUET AQUEOUS SOLUTION OF FORMIC ACID OF A CONCENTRATION BETWEEN .1 NORMAL AND 1 NORMAL, AND A MONOHYDRIC ALIPHATIC ALCOHOL CONTAINING UP TO 4 CARBON ATOMS, SUBSEQUENTLY APPLYING SAID SILICA SOLUTION TO THE SURFACE OF THE AFORESAID SOLID BODY AND HEATING SAID SILICA COATED SURFACE TO REMOVE ANY FORMIC ACID WHICH MAY REMAIN IN SAID COATING.
Claim 2
Dependent Claim
89 words
A PROCESS FOR PRODUCING A SILICA COATING ON A SOLID BODY COMPRISING FORMING A COLLOIDAL HYDRATED SILICA SOLUTION BY HYDROLYZING AN ALKYL SILICATE IN THE PRESENCE OF AN ACID HYDROLYZING AGENT COMPRISING A DILUET AQUEOUS SOLUTION OF FORMIC ACID OF A CONCENTRATION BETWEEN .1 NORMAL AND 1 NORMAL, AND A MONOHYDRIC ALIPHATIC ALCOHOL CONTAINING UP TO 4 CARBON ATOMS, SUBSEQUENTLY APPLYING SAID SILICA SOLUTION TO THE SURFACE OF THE AFORESAID SOLID BODY AND HEATING SAID SILICA COATED SURFACE TO REMOVE ANY FORMIC ACID WHICH MAY REMAIN IN SAID COATING.
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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) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |