US3493597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aqueous quaternary ammonium salt solutions
Assignee: Monsanto Co
•
Filing: 1967-05-25
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Granted: 1970-02-03
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Charles R Campbell
- 👤 Robert Johnson
- 👤 Darrell M Jones
- 👤 Jim N Maloney Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:52
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/29; C25B3/295; C25B3/01; C25B3/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |