US3881993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing device for microorganisms
Assignee: Bayer Corp
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Filing: 1973-05-07
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Granted: 1975-05-06
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Expires: 1993-05-07
Abstract
Abstract An improved test device for assaying a liquid specimen for microorganisms. The device is adapted to be inoculated by immersion in the specimen and to thereafter culture microorganisms therein by incubation in a sealable container. The device generally includes an absorbent matrix impregnated with a nutrient medium containing test reagents and a culture-fixing agent for localizing colony locations throughout the culturing period.
Inventors
- 👤 Ronald Freake
- 👤 Leon Francis Strenkoski
- 👤 Daniel Glen Aitken
- 👤 Billy Harper Haden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:36
CPC Classifications
C; C12; C12M; C12M25/00; C12M25/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
62 words
A TEST DEVICE FOR ANALYZING A SAMPLE FOR MICROORGANISMS, SAID DEVICE BEING ADAPTED TO BE INOCULATED WITH THE SAMPLE AND INCUBATED IN A SEALABLE CONTAINER, THE DEVICE COMPRISING: AN ABSORBENT MATRIX IMPREGNATED WITH A NUTRIENT MEDIUM, A REAGENT, AND A WATER SOLUBLE CULTURE-FIXING AGENT AGENT CAPABLE OF FORMING A VISCOUS SUSPENSION IN AN AQUEOUS SOLUTION TO LOCALIZE THE MICROORGANISMS ON SAID MATRIX.
Claim 2
Dependent Claim
62 words
A TEST DEVICE FOR ANALYZING A SAMPLE FOR MICROORGANISMS, SAID DEVICE BEING ADAPTED TO BE INOCULATED WITH THE SAMPLE AND INCUBATED IN A SEALABLE CONTAINER, THE DEVICE COMPRISING: AN ABSORBENT MATRIX IMPREGNATED WITH A NUTRIENT MEDIUM, A REAGENT, AND A WATER SOLUBLE CULTURE-FIXING AGENT AGENT CAPABLE OF FORMING A VISCOUS SUSPENSION IN AN AQUEOUS SOLUTION TO LOCALIZE THE MICROORGANISMS ON SAID MATRIX.
Claim 3
Dependent Claim
16 words
A test device as defined in claim 1 wherein said matrix includes a flat bibulous material.
Claim 4
Dependent Claim
18 words
A test device as defined in claim 2 wherein said bibulous material has a known constant absorption capacity.
Claim 5
Dependent Claim
15 words
A test device as defined in claim 1 wherein said reagent includes a color indicator.
Claim 6
Dependent Claim
14 words
A test device as defined in claim 4 wherein said indicator is triphenyltetrazolium chloride.
Claim 7
Dependent Claim
16 words
A test device as defined in claim 1 wherein said culture-fixing agent is an inert gum.
Claim 8
Dependent Claim
16 words
A test device as defined in claim 1 wherein said culture-fixing agent is a linear polysaccharide.
Claim 9
Dependent Claim
15 words
A test device as defined in claim 1 wherein said culture-fixing agent is sodium alginate.
Claim 10
Dependent Claim
58 words
A test device for analyzing a sample for microorganisms, the device comprising; an absorbent matrix impregnated with a nutrient medium, a reagent and a culture-fixing agent capable of forming a viscous suspension in an aqueous solution to localize the microorganisms on said matrix; a holder attached to said matrix; and a sealable container enclosing said matrix and holder.
Claim 11
Dependent Claim
58 words
A test device for analyzing a sample for microorganisms, the device comprising; an absorbent matrix impregnated with a nutrient medium, a reagent and a culture-fixing agent capable of forming a viscous suspension in an aqueous solution to localize the microorganisms on said matrix; a holder attached to said matrix; and a sealable container enclosing said matrix and holder.
Claim 12
Dependent Claim
16 words
A test device as defined in claim 9 wherein said holder includes a stiff elongated member.
Claim 13
Dependent Claim
13 words
A test device as defined in claim 10 wherein said container is transparent.
Claim 14
Dependent Claim
16 words
A test device as defined in claim 10 wherein said container includes an interlocking seal lip.
References Cited (Backward Citations)
US2904474A
Cited
US3532603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |