Patent US1999488A successfully refreshed from Google Patents.
US3553082A
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Method and means for detecting coliform bacteria in water
Assignee: Hach Co
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Filing: 1967-09-13
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Granted: 1971-01-05
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Expires: 1987-09-13
Abstract
Abstract A METHOD AND MEANS FOR DETERMINING THE PRESENCE OR ABSENCE OF SPECIFIC BACTERIA SUCH AS COLIFORM BACTERIA IN A TEST SAMPLE BY CONTACTING A FIRST NUTRIENT MEDIUM SUCH AS A LACTOSE BROTH IN A FIRST ENVIROMENT WITH A LIQUID SAMPLE, MAINTAINING A SECOND NUTRIENT MEDIUM SUCH AS A BRILLIANT GREEN LACTOSE BILE BROTH SOLUTION IN A SECOND ENVIRONMENT IN CONTACT WITH THE TEST SAMPLE AND THE FIRST NUTRIENT MEDIUM SO THAT A PREDETERMINED RATE OF TRANSFER TAKES PLACE AND OBSERVING THE ENVIRONMENTS TO DETERMINE WHETHER ANY PHYSICAL OR CHEMICAL CHANGE TAKES PLACE, CHARACTERISTIC OF THE BACTERIA UNDER DETERMINATION, SUCH AS GAS FORMATION.
Inventors
- 👤 Clifford C Hach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:50
CPC Classifications
C; C12; C12M; C12M41/00; C12M41/30; C12M41/36
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |