Patent US3862959A successfully refreshed from Google Patents.
US3862959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic acetals of alpha-oxocarboxylic acid derivatives
Assignee: Shell USA Inc
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Filing: 1972-05-18
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Granted: 1975-01-28
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Expires: 1992-05-18
Abstract
Abstract Cyclic acetals of the formula WHERE R1 is hydroxy, alkoxy, or NHZ, Z is hydrogen, alkyl, cycloalkyl, benzyl, or optionally substituted phenyl, R2 is hydrogen or alkyl, R3 is alkyl, and R4 is aralkyl, are useful as herbicides.
Inventors
- 👤 Peter Kirby
- 👤 Eirlys R Isaac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:17
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D319/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A compound according to claim 1 where R1 is -NHZ in which Z is phenyl, fluorophenyl, chlorophenyl, dichlorophenyl, tolyl, dimethylphenyl, or methoxyphenyl; R2 is hydrogen or methyl; R3 is methyl, ethyl or propyl and R4 is benzyl.
Claim 2
Dependent Claim
17 words
A compound according to claim 2 where R1 is -NHZ, Z is phenyl, and R2 is methyl.
Claim 3
Dependent Claim
1 words
4-Benzyloxymethyl-4-ethyl-2-methyl-1,3-dioxolane-2-(N-phenylcarboxamide).
Claim 4
Dependent Claim
1 words
4-benzyloxymethyl-2,4-dimethyl-1,3-dioxolan-2-(N-phenylcarboxamide).
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |