Patent US3794503A successfully refreshed from Google Patents.
US3794503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow spheres consisting of alkali metal silicate and a polysalt
Assignee: PQ Corp
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Filing: 1972-05-12
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Granted: 1974-02-26
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Expires: 1992-05-12
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF AN ECONOMICAL FILLER OF LOW BULK DENSITY THAT IS ESPECIALLY USEFUL FOR INCORPORATION IN UNSATURATED POLYESTER SYSTEMS AND WHICH DOES NOT REACT WITH COMPONENTS OF THE UNSATURATED POLYESTER SYSTEM. SOLUTIONS OF SODIUM SILICATE AND INORGANIC POLYSALTS ARE MIXED, SPRAY DRIED, AND THE PRODUCT FROM THE SPRAY DRIER IS THEN FURTHER DRIED TO A WATER CONTENT BELOW ABOUT 7%.
Inventors
- 👤 D Netting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:46
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/04; C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/26; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |