US3687640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomerating alkali metal silicate by tumbling and rolling while heating and cooling
Assignee: PQ Corp
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Filing: 1971-01-18
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Granted: 1972-08-29
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Expires: 1991-01-18
Abstract
Abstract HYDRATED, SOLUBLE ALKALI METAL SILICATE PARTICLES ARE AGGLOMERATED BY TUMBLING DURING THE INTRODUCTION OF LIMITED ADDITIONAL MOISTURE AND/OR HEAT, FORMING GRANULES OF DESIRED LARGER SIZE AND HAVING PREFERRED DENSITY, DISSOLVING, STRENGTH, AND FREE-FLOWING CHARACTERISTICS FOR USES SUCH AS IN DETERGENT FORMULATIONS.
Inventors
- 👤 Robert H Sams
- 👤 Robert W Linton
- 👤 Helmut H Weldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:27
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; C; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325; Y; Y10; Y10S; Y10S159/00; Y10S159/03; Y10S159/14
Claims Analysis
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |