US4017420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable oxidase reagent solutions
Assignee: GlaxoSmithKline LLC
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Filing: 1975-12-22
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Granted: 1977-04-12
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Expires: 1995-12-22
Abstract
Abstract Stable oxidase reagent solutions containing N,N,N',N'-tetramethyl-p-phenylenediamine or N,N-dimethyl-p-phenylenediamine for determining the presence of oxidase in microbial colonies.
Inventors
- 👤 Betty Anne Bowie
- 👤 Joseph F. Pagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:01
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/02; C12Q1/04; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/871
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
A stable oxidase reagent solution for detection of microbial colonies comprising from about 0.1% to about 1.0% by weight of N,N,N',N'-tetramethyl-p-phenylenediamine or N,N-dimethyl-p-phenylenediamine in dimethyl sulfoxide or acid addition salts thereof.
Claim 2
Dependent Claim
31 words
A stable oxidase reagent solution for detection of microbial colonies comprising from about 0.1% to about 1.0% by weight of N,N,N',N'-tetramethyl-p-phenylenediamine or N,N-dimethyl-p-phenylenediamine in dimethyl sulfoxide or acid addition salts thereof.
Claim 3
Dependent Claim
11 words
The reagent solution of claim 1 wherein the diamine is N,N,N',N'-tetramethyl-p-phenylenediamine.
Claim 4
Dependent Claim
14 words
The reagent of claim 2 wherein the diamine is present as the dihydrochloride salt.
Claim 5
Dependent Claim
11 words
The reagent solution of claim 1 wherein the diamine is N,N-dimethyl-p-phenylenediamine.
References Cited (Backward Citations)
US3876503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |