Patent US4235780A successfully refreshed from Google Patents.
US4235780A
Expired / Lapsed
US
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Derivatives of 2H-pyran-2-one
Assignee: FMC Corp
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Filing: 1979-11-01
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Granted: 1980-11-25
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Expires: 1999-11-01
Abstract
Abstract Processes for producing a (1α, 4α, 5α)-6,6-dimethyl-4-halo-substituted-methyl-3-oxabicyclo[3.1.0]hexan-2-one and its novel intermediates from known and inexpensive starting materials are described and exemplified.
Inventors
- 👤 Kiyoshi Kondo
- 👤 Toshiyuki Takashima
- 👤 Minoru Suda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:59
CPC Classifications
C; C07; C07C; C07C321/00; C07C59/00; C07C59/147; C07D; C07D307/00; C07D307/77; C07D307/93; C07D309/00; C07D309/16; C07D309/28; C07D309/30; C07D309/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A compound of the formula ##STR17## wherein X 1 and X 2 are the same or different and each is an independently selected halogen atom, a trichloromethyl group, or a trifluoromethyl group, and Y 1 and Y 2 are independently bromine or chlorine atoms with the proviso that Y 1 is a bromine atom when at least one of X 1 , X 2 , and Y 2 is a bromine atom.
Claim 2
Dependent Claim
72 words
A compound of the formula ##STR17## wherein X 1 and X 2 are the same or different and each is an independently selected halogen atom, a trichloromethyl group, or a trifluoromethyl group, and Y 1 and Y 2 are independently bromine or chlorine atoms with the proviso that Y 1 is a bromine atom when at least one of X 1 , X 2 , and Y 2 is a bromine atom.
Claim 3
Dependent Claim
22 words
The compound of claim 1 wherein X 1 and X 2 are the same and each is a bromine or chlorine atom.
Claim 4
Dependent Claim
14 words
The compound of claim 2 wherein X 1 and X 2 are chlorine atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |