US3769309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for alkali metal and quaternary nitrogen compound double salts of silicic acid
Assignee: PQ Corp
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Filing: 1968-11-15
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Granted: 1973-10-30
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Expires: 1988-11-15
Abstract
Abstract DOUBLE SILICATE SALTS OF ALKALI METALS AND QUATERNARY NITROGEN COMPOUNDS ARE PREPARED BY THE REACTION OF (A) AN ALKYLENE OXIDE, (B) AN AMINE, AND (C) AN ALKALI METAL SILICATE.
Inventors
- 👤 H Weldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
C; C01; C01B; C01B37/00; C01B37/02; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |