US3819490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing device for use when making bacteriological tests
Assignee: Individual
•
Filing: 1971-12-08
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Granted: 1974-06-25
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Expires: 1991-12-08
Abstract
Abstract The invention concerns a preferably star-shaped testing device for bacteriological tests. Circular discs of filter paper impregnated with different antibiotics are interconnected by arms of the same material. At least adjacent the discs, said arms are impregnated so as to break the capillary action of the filter paper and prevent migration of the antibiotic into the arm. The arms are also provided with scales permitting simple determination of the clear zones around the discs when the testing device is put on a culture plate.
Inventors
- 👤 E Klingstrom
- 👤 S Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
C; C12; C12M; C12M41/00; C12M41/30; C12M41/36; C12Q; C12Q1/00; C12Q1/02; C12Q1/18; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
The testing device of claim 1 further characterized in that said arm members extend radially outward from a central connecting portion.
Claim 2
Dependent Claim
50 words
The testing device of claim 1 further characterized in that each of said disc portions is impregnated with a different antibiotic, the various antibiotics forming a combination selected from a plurality of predetermined antibiotics combinations, each of which is effective against a certain group of bacteria and type of infection.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |