US3825585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-cycloalkyl hydroxamic acids
Assignee: KERR MC GEE CORP
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Filing: 1971-06-03
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Granted: 1974-07-23
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Expires: 1991-06-03
Abstract
Abstract A NEW CLASS OF COMPOUNDS USEFUL, FOR EXAMPLE, AS METAL EXTRACTANTS, IS PROVIDED. THE COMPOUNDS ARE HYDROXAMIC ACIDS, WITH N-CYCLOALKYL GROUPS AND REPRESENTED BY THE GENERAL FORMULA: R-CO-N(-OH)-CH<(-(CH2)N-CH2-) WHEREIN N IS AN INTEGER OF FROM 3 TO 6, INCLUSIVE, AND R IS A HYDROCARBON RADICAL CONTAINING FROM 1 TO 20 CARBON ATOMS.
Inventors
- 👤 C Chappelow
- 👤 J Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:03
CPC Classifications
C; C07; C07F; C07F9/00; C07C; C07C2601/00; C07C2601/12; C07C2601/14
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |