Patent US3801475A successfully refreshed from Google Patents.
US3801475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-foaming process by the addition of a quaternary ammonium salt
Assignee: Texas Petrochemicals Corp
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Filing: 1969-12-19
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Granted: 1974-04-02
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Expires: 1989-12-19
Abstract
Abstract FOAMING IN THE DISTILLATION OF POLAR MATERIALS FROM WATER CAN BE CURTAILED BY ADDING BETWEEN 20 AND 200 P.P.M. OF DIALKYL DICOCO QUATERNARY AMMONIUM SALT TO THE MATERIAL TO BE DISTILLED PREFERABLY PRIOR TO THE BEGINNING OF THE DISTILLATION.
Inventors
- 👤 W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:45
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0413
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |