Patent US4023934A successfully refreshed from Google Patents.
US4023934A
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Color indicator apparatus for presence of oxygen
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1975-12-22
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Granted: 1977-05-17
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Expires: 1995-12-22
Abstract
Abstract A color indicator apparatus for determining the presence of oxygen which comprises a container which permits flow of gas thereto, an ampoule in the container, said ampoule containing a redox color indicator liquid, and an absorbent material, for the liquid in the ampoule, in the container. Typically the redox color indicator is methylene blue or resazurin. The apparatus is useful for determining if an anaerobic atmosphere exists around a micro-organism culture.
Inventors
- 👤 Ernest Elliott Spinner
- 👤 Melvin Wayne Hounsell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:18
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/225
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A color indicator apparatus for determining the presence of oxygen which comprises: a flexible polymeric tube open at both ends, an ampoule in and in contact with the tube, said ampoule containing a redox color indicator liquid, an absorbent material, for the liquid in the ampoule, in the tube, and a gas permeable, liquid impervious, bacteriological filter at each end of the tube.
Claim 2
Dependent Claim
63 words
A color indicator apparatus for determining the presence of oxygen which comprises: a flexible polymeric tube open at both ends, an ampoule in and in contact with the tube, said ampoule containing a redox color indicator liquid, an absorbent material, for the liquid in the ampoule, in the tube, and a gas permeable, liquid impervious, bacteriological filter at each end of the tube.
Claim 3
Dependent Claim
95 words
A color indicator apparatus for determining the presence of oxygen which comprises: a flexible polymeric tube open at both ends, an ampoule in and in contact with the tube, said ampoule containing a redox color indicator liquid, an absorbent material, for the liquid in the ampoule, in the tube, a gas permeable, liquid impervious bacteriological filter at each end of the tube, and a cap, having a hole therein which permits passage of gas, on the end of each tube to hold the filters in place and the absorbent material and ampoule in the tube.
Claim 4
Dependent Claim
95 words
A color indicator apparatus for determining the presence of oxygen which comprises: a flexible polymeric tube open at both ends, an ampoule in and in contact with the tube, said ampoule containing a redox color indicator liquid, an absorbent material, for the liquid in the ampoule, in the tube, a gas permeable, liquid impervious bacteriological filter at each end of the tube, and a cap, having a hole therein which permits passage of gas, on the end of each tube to hold the filters in place and the absorbent material and ampoule in the tube.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |