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Patent US4050918A successfully refreshed from Google Patents.
US4050918A
Expired / Lapsed
US
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Herbicidal semicarbazides
Assignee: Shell USA Inc
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Filing: 1976-05-19
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Granted: 1977-09-27
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Expires: 1996-05-19
Abstract
Abstract 2-Phenylsemicarbazides of the formula ##STR1## where R 1 , R 2 and R 3 are hydrocarbyl, X is hydrogen or halogen and X 1 is halogen, alkyl or alkoxy optionally substituted by halogen, useful as herbicides, are prepared by treatment of the appropriately substituted 2-phenylsemicarbazone with an aqueous acid followed by treatment with a base and optionally further an alkylating or acylating agent.
Inventors
- 👤 Kurt H. G. Pilgram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:18
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A method for controlling undesirable plant growth which comprises applying to the locus to be protected, in amount sufficient to exert herbicidal action, a compound of the formula ##STR10## wherein R 1 and R 2 are each independently alkyl of 1 to 4 carbon atoms; X and X 1 each is halogen of atomic number 9 to 35, inclusive, or an acid addition salt thereof selected from the group of hydrochloric, hydrobromic, sulfuric, phosphoric, nitric, maleic, fumaric, citric tartaric, methanesulfonic, ethanesulfonic, acetic or benzoic acids.
Claim 2
Independent Claim
85 words
A method for controlling undesirable plant growth which comprises applying to the locus to be protected, in amount sufficient to exert herbicidal action, a compound of the formula ##STR10## wherein R 1 and R 2 are each independently alkyl of 1 to 4 carbon atoms; X and X 1 each is halogen of atomic number 9 to 35, inclusive, or an acid addition salt thereof selected from the group of hydrochloric, hydrobromic, sulfuric, phosphoric, nitric, maleic, fumaric, citric tartaric, methanesulfonic, ethanesulfonic, acetic or benzoic acids.
Claim 3
Dependent Claim
16 words
A herbicidal composition comprising a compound according to claim 1 and an inert agricultural carrier therefor.
Claim 4
Dependent Claim
22 words
A method according to claim 1 wherein R 1 and R 2 are each methyl; and X and X 1 is chlorine.
Claim 5
Dependent Claim
23 words
A method according to claim 1 wherein R 1 and R 2 are each methyl; X is fluorine and X 1 is chlorine.
Claim 6
Independent Claim
70 words
A method for controlling undesirable plant growth which comprises applying to the locus to be protected, in amount sufficient to exert herbicidal action, a compound having the formula ##STR11## wherein R 1 and R 2 each is alkyl of 1 to 4 carbon atoms, or an acid addition salt thereof selected from the group of hydrochloric, hydrobromic, sulfuric, phosphoric, nitric, maleic, fumaric, citric, tartaric, methanesulfonic, ethanesulfonic, acetic or benzoic acids.
Claim 7
Independent Claim
70 words
A method for controlling undesirable plant growth which comprises applying to the locus to be protected, in amount sufficient to exert herbicidal action, a compound having the formula ##STR11## wherein R 1 and R 2 each is alkyl of 1 to 4 carbon atoms, or an acid addition salt thereof selected from the group of hydrochloric, hydrobromic, sulfuric, phosphoric, nitric, maleic, fumaric, citric, tartaric, methanesulfonic, ethanesulfonic, acetic or benzoic acids.
Claim 8
Dependent Claim
15 words
A method according to claim 5 wherein R 1 and R 2 are each methyl.
Claim 9
Dependent Claim
16 words
A herbicidal composition comprising a compound according to claim 5 and an inert agricultural carrier therefore.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |