Patent US3883522A successfully refreshed from Google Patents.
US3883522A
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Substituted pyrido(1,2,3-de)-1,4-benzoxazines
Assignee: Riker Laboratories Inc
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Filing: 1974-02-11
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Granted: 1975-05-13
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Expires: 1994-02-11
Abstract
Abstract Anti-microbial agents which are 2,3-dihydro-3-substituted-7-oxopyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acids are prepared by condensation of benzoxazines with ethoxymethylene malonate esters followed by ring closure with poly phosphoric acid and hydrolysis of the resulting esters.
Inventors
- 👤 John F Gerster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:13
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/535; A01; A01N; A01N43/00; A01N43/90; C; C07; C07D; C07D498/00; C07D498/02; C07D498/06; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
10 words
A compound according to claim 1 wherein R3 is hydrogen.
Claim 4
Dependent Claim
11 words
A compound according to claim 1 wherein R1 is lower alkyl.
Claim 5
Dependent Claim
12 words
A compound according to claim 1 wherein n is one or two.
Claim 6
Dependent Claim
14 words
A compound according to claim 1 wherein n is one and R2 is halogen.
Claim 7
Dependent Claim
11 words
A compound according to claim 2 wherein R1 is lower alkyl.
Claim 8
Dependent Claim
12 words
A compound according to claim 2 wherein n is one or two.
Claim 9
Dependent Claim
14 words
A compound according to claim 2 wherein n is one and R2 is halogen.
Claim 10
Dependent Claim
12 words
A compound according to claim 6 wherein n is one or two.
Claim 11
Dependent Claim
14 words
A compound according to claim 6 wherein n is one and R2 is halogen.
Claim 12
Dependent Claim
12 words
A compound according to claim 3 wherein R1 is methyl or ethyl.
Claim 13
Dependent Claim
12 words
A compound according to claim 6 wherein R1 is methyl or ethyl.
Claim 14
Dependent Claim
12 words
A compound according to claim 9 wherein R1 is methyl or ethyl.
Claim 15
Dependent Claim
12 words
A compound according to claim 10 wherein R1 is methyl or ethyl.
Claim 16
Dependent Claim
12 words
A compound according to claim 5 wherein R2 is fluorine or chlorine.
Claim 17
Dependent Claim
12 words
A compound according to claim 8 wherein R2 is fluorine or chlorine.
Claim 18
Dependent Claim
12 words
A compound according to claim 10 wherein R2 is fluorine or chlorine.
Claim 19
Dependent Claim
9 words
The compound 10-chloro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6 -carboxylic acid according to claim 17.
Claim 20
Dependent Claim
9 words
The compound 2,3-dihydro-9-fluoro-3-methyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6 -carboxylic acid according to claim 10.
Claim 21
Dependent Claim
9 words
The compound 2,3-dihydro-10-fluoro-3-methyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6 -carboxylic acid according to claim 17.
Claim 22
Dependent Claim
9 words
The compound 9-chloro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxaZine-6 -carboxylic acid according to claim 17.
Claim 23
Dependent Claim
8 words
The compound 10-chloro-2,3-dihydro-3,8-dimethyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid according to claim 9.
Claim 24
Dependent Claim
9 words
The compound 2,3-dihydro-3,10-dimethyl-7-oxo-7H-pyrido(1,2, 3-de)-1,4-benzoxazine-6-carboxylic acid according to claim 9.
Claim 25
Dependent Claim
8 words
The compound 9-chloro-2,3-dihydro-3,10-dimethyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid according to claim 9.
Claim 26
Dependent Claim
9 words
The compound 2,3-dihydro-7-oxo-3,8,10-trimethyl-7H-pyrido(1, 2,3-de)-1,4-benzoxazine-6-carboxylic acid according to claim 9.
Claim 27
Dependent Claim
9 words
The compound 2,3-dihydro-3,9-dimethyl-7-oxo-7H-pyrido(1,2,3-de)-1,4-benzoxazine-6 -carboxylic acid according to claim 9.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |