US3962041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring the opacity of fluids
Assignee: Chemap AG
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Filing: 1975-03-17
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Granted: 1976-06-08
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Expires: 1995-03-17
Abstract
Abstract From a vessel in which micro-organisms grow in a liquid medium containing gas bubbles, a sample is withdrawn into an exterior measuring chamber by means of suction. Gas bubbles are allowed to escape from the sample and thereafter the opacity or turbidity of the sample is measured by passing a light beam through it.
Inventors
- 👤 Hans Muller
- 👤 Werner Stumpp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:13
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534; C; C12; C12M; C12M41/00; C12M41/30; C12M41/36; G01N21/01; G01N21/03; G01N21/05; G01N2021/054; G01N21/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
Apparatus for measuring the opacity of fluids, particularly for monitoring the growth of microorganisms suspended in a gas-containing liquid medium by measuring turbidity, comprising wall means forming a measuring chamber adapted to be placed into communication with a vessel containing the medium to be measured; suction means for drawing a sample of the medium into the measuring chamber; and measuring means for measuring the turbidity of the sample.
Claim 2
Dependent Claim
68 words
Apparatus for measuring the opacity of fluids, particularly for monitoring the growth of microorganisms suspended in a gas-containing liquid medium by measuring turbidity, comprising wall means forming a measuring chamber adapted to be placed into communication with a vessel containing the medium to be measured; suction means for drawing a sample of the medium into the measuring chamber; and measuring means for measuring the turbidity of the sample.
Claim 3
Dependent Claim
16 words
Apparatus as defined in claim 1, wherein said measuring means comprises a photoelectric turbidity measuring arrangement.
Claim 4
Dependent Claim
13 words
Apparatus as defined in claim 1, wherein said suction means comprises a bellows.
Claim 5
Dependent Claim
17 words
Apparatus as defined in claim 1, wherein said suction means comprises a bellows of synthetic plastic material.
Claim 6
Dependent Claim
16 words
Apparatus as defined in claim 1, wherein said suction means comprises a synthetic plastic roll membrane.
Claim 7
Dependent Claim
42 words
Apparatus as defined in claim 1, wherein said measuring chamber comprises a passage for communication with said vessel; said suction means comprising a piston having a portion adapted to travel in said passage and provided with a wiper for cleaning said passage.
Claim 8
Dependent Claim
31 words
Apparatus as defined in claim 6, wherein said measuring means comprises two lenses at opposite sides of said passage; and wherein said wiper is a disc which wipes over said lenses.
References Cited (Backward Citations)
US3065148A
Cited
US3531209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |