US3789060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorinated camphor derivatives and europium and praseodymium chelates thereof
Assignee: Wisconsin Alumni Research Foundation
•
Filing: 1971-11-03
•
Granted: 1974-01-29
•
Expires: 1991-11-03
Abstract
Abstract Optically active fluorinated compounds derived from d- or lcamphor and their corresponding europium and praseodymium chelates and their use as chiral NMR shift reagents.
Inventors
- 👤 H Goering
- 👤 J Eikenberry
- 👤 G Koermer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:50
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/92; C07C45/00; C07C45/45; C07C45/455; C07C45/87; C07C45/88; C07C49/385; C07C49/457; C07C49/467; C07C49/473; C07C49/477; C07C49/487; C07C49/507; C07C49/513; C07F; C07F5/00; C07F5/003; G; G01; G01N; G01N24/00; G01N24/08; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/281; Y; Y10; Y10T; Y10T436/00; Y10T436/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The chelates as claimed in claim 1 in which the R group has from one to five carbon atoms.
Claim 2
Dependent Claim
5 words
The compound tris(3-(trifluoromethylhydroxymethylene)-d-camphorato) europium (III).
Claim 3
Dependent Claim
5 words
The compound tris(3-heptafluoropropylhydroxymethylene)-d-camphorato) europium (III).
Claim 4
Dependent Claim
5 words
The compound tris(3-trifluoromethylhydroxymethylene-d-camphorato) praseodymium (III).
Claim 5
Dependent Claim
5 words
The compound tris(3-(heptafluoropropylhydroxymethylene)-d-camphorato) praseodymium (III).
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |