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Patent US3900514A successfully refreshed from Google Patents.
US3900514A
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US
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N-cycloalkyl hydroxamic acids
Assignee: Kerr McGee Corp
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Filing: 1973-10-29
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Granted: 1975-08-19
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Expires: 1993-10-29
Abstract
Abstract WHEREIN N IS AN INTEGER OF FROM 3 TO 6, INCLUSIVE, AND R is a hydrocarbon radical containing from 1 to 20 carbon atoms. 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: D R A W I N G
Inventors
- 👤 Jr Cecil C Chappelow
- 👤 James F Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:25
CPC Classifications
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Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
17 words
A compound as set forth in claim 1 wherein R contains from 6 to 16 carbon atoms.
Claim 4
Dependent Claim
12 words
A compound as set forth in claim 2 wherein n equals 3.
Claim 5
Dependent Claim
12 words
A compound as set forth in claim 2 wherein n equals 4.
Claim 6
Dependent Claim
12 words
A compound as set forth in claim 2 wherein n equals 5.
Claim 7
Dependent Claim
12 words
A compound as set forth in claim 2 wherein n equals 6.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |