US3848030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical isomers of binaphthyl-phosphoric acids
Assignee: Richardson Merrell SpA
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Filing: 1972-03-10
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Granted: 1974-11-12
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Expires: 1992-03-10
Abstract
Abstract 1. THE ESSENTIALLY PURE SINGLE OPTICAL ISOMER OF A COMPOUND OF THE STRUCTURAL FORMULA 4-(O=),4-(HO-),DI(R-),DI(R1-)-4H-DINAPHTHO(2,1-D:1'',2''-F)- (1,3,2)DIOXAPHOSPHEPIN IN WHICH R AND R1 ARE SYMMMETRICAL AND INDEPENDENTLY HYDROGEN, HALOGEN, LOWER ALKYL OF 1 TO 8 CARBON ATOMS INCLUSIVELY OR NITRO, AND THEIR CORRESPONDING BI-4,5,6,7TETRAHYDRONAPHTHYL COMPOUNDS ESSENTIALLY FREE OF THE CORRESPONDING ISOMER.
Inventors
- 👤 R Viterbo
- 👤 J Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:07
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65744
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
THE ESSENTIALLY PURE SINGLE OPTICAL ISOMER OF A COMPOUND OF THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
13 words
THE ESSENTIALLY PURE SINGLE OPTICAL ISOMER OF A COMPOUND OF THE STRUCTURAL FORMULA
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |