US3634558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing monodisperse silica spheres having a dispersed radioactive tracer
Assignee: United States Atomic Energy Commission
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Filing: 1968-10-29
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Granted: 1972-01-11
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Expires: 1988-10-29
Abstract
Abstract A PROCESS FOR PRODUCING MONODISPERSE SILICA SPHERS OF UNIFORM SIZE BY AGITATING AN AQUEOUS ALCOHOLIC SOLUTION CONTAINING AMMONIA AND LOWER ALKYL TETRAESTERS OF SILICIC ACID.
Inventors
- 👤 Werner Stober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
G; G21; G21H; G21H5/00; G21H5/02; C; C09; C09K; C09K23/00; C09K23/54
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |