US2574902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical processes and composition
Assignee: EIDP Inc
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Filing: 1948-12-15
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Granted: 1951-11-13
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Expires: 1968-12-15
Abstract
No abstract record available.
Inventors
- 👤 Max F Bechtold
- 👤 Omar E Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/151
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS COMPRISING BUILDING UP THE SIZE OF PARTICLES IN AN AQUEOUS SILICA SOL FROM LESS THAN 10 MILLIMICRONS TO A LARGER SIZE, THE MAXIMUM SIZE BEING 130 MILLIMICRONS, BY FORMING A HEEL BY HEATING AT FROM 60* C. TO ABOUT THE BOILING TEMPERATURE AT ATMOSPHERIC PRESSURE AN AQUEOUS SOL OF SILICA PARTICLES OF LESS THAN 10 MILLIMICRONS DIAMETER, THE HEEL, AFTER HEATING, HAVING A RELATIVE VISCOSITY OF FROM 1.15 TO 1.60 AT 10% SIO2, ADDING TO SAID HEEL A SILICA SOL CONTAINING PARTICLES OF LESS THAN 10 MILLIMICRONS DIAMETER, AND CONTINUING THE ADDITION AND HEATING UNTIL AT LEAST 5 TIMES AS MUCH SILICA HAS BEEN ADDED TO THE HEEL AS WAS ORIGINALLY PRESENT.
Claim 2
Dependent Claim
114 words
A PROCESS COMPRISING BUILDING UP THE SIZE OF PARTICLES IN AN AQUEOUS SILICA SOL FROM LESS THAN 10 MILLIMICRONS TO A LARGER SIZE, THE MAXIMUM SIZE BEING 130 MILLIMICRONS, BY FORMING A HEEL BY HEATING AT FROM 60* C. TO ABOUT THE BOILING TEMPERATURE AT ATMOSPHERIC PRESSURE AN AQUEOUS SOL OF SILICA PARTICLES OF LESS THAN 10 MILLIMICRONS DIAMETER, THE HEEL, AFTER HEATING, HAVING A RELATIVE VISCOSITY OF FROM 1.15 TO 1.60 AT 10% SIO2, ADDING TO SAID HEEL A SILICA SOL CONTAINING PARTICLES OF LESS THAN 10 MILLIMICRONS DIAMETER, AND CONTINUING THE ADDITION AND HEATING UNTIL AT LEAST 5 TIMES AS MUCH SILICA HAS BEEN ADDED TO THE HEEL AS WAS ORIGINALLY PRESENT.
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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |