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Patent US4036847A successfully refreshed from Google Patents.
US4036847A
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Halogenated penam derivatives and the preparation thereof
Assignee: Astellas Pharma Inc
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Filing: 1976-08-05
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Granted: 1977-07-19
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Expires: 1996-08-05
Abstract
Abstract A penam derivative having the formula: ##STR1## wherein X represents a halogen atom, and wherein R 1 represents an amino or acylamino, and R 3 represents a radical selected from the group consisting of carboxy, ester, acid amide, acid anhydride, acid halide, and acid azide.
Inventors
- 👤 Takashi Kamiya
- 👤 Yoshihisa Saito
- 👤 Tsutomu Teraji
- 👤 Osamu Nakaguti
- 👤 Teruo Oku
- 👤 Hitoshi Nakamura
- 👤 Masashi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:34
CPC Classifications
C; C07; C07D; C07D499/00; C07D205/00; C07D205/02; C07D205/06; C07D205/08; C07D205/09; C07D205/095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A penam derivative having the formula: ##STR23## wherein X represents a halogen atom, and wherein R 1 represents an amino, and R 3 represents a radical selected from the group consisting of carboxy, conventional ester, acid amide, acid anhydride, acid halide, acid azide, and acid salt, or a pharmaceutically acceptable salt thereof.
Claim 2
Dependent Claim
52 words
A penam derivative having the formula: ##STR23## wherein X represents a halogen atom, and wherein R 1 represents an amino, and R 3 represents a radical selected from the group consisting of carboxy, conventional ester, acid amide, acid anhydride, acid halide, acid azide, and acid salt, or a pharmaceutically acceptable salt thereof.
Claim 3
Dependent Claim
15 words
The penam derivative of claim 1, which is 6-amino-2-methyl-2-halomethylpenam-3-carboxylic acid, or a conventional ester thereof.
Claim 4
Dependent Claim
11 words
The penam derivative of claim 1, which is 2,2,2-trichloroethyl 6-amino-2-methyl-2-bromomethylpenam-3-carboxylate hydrochloride.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |