Patent US3564262A successfully refreshed from Google Patents.
US3564262A
Expired / Lapsed
US
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Turbidimeter using a pressurized fluid container
Assignee: Hach Co
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Filing: 1968-02-07
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Granted: 1971-02-16
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Expires: 1988-02-07
Abstract
Abstract A turbidimeter for fluid under pressure consisting of a pipe section having a thick optical glass window through which light is refracted into the liquid at a very shallow angle. A photocell is positioned to sense light reflected by turbidity particles in the fluid.
Inventors
- 👤 Clifford C Hach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A turbidimeter comprising, in combination, a chamber for receiving and containing fluid, said chamber having a wall with an elongated opening therein, a thick transparent block sealed over said opening, a light source for directing a beam of light into an edge of said block so that the beam is refracted into the fluid through said opening at a small angle from from the plane of the block, and a light sensing cell positioned above said block to receive light reflected by turbidity particles illuminated in the fluid by said beam, said light sensing cell being adjustable from a position to receive reflected light coming from the region immediately adjacent the block-fluid interface so that high turbidities can be measured with no tendency for the instrument to go blind to a position to receive reflected light coming from a region where said beam is spaced from said block so that low turbidities can be measured with no reflection to the cell from portions of the block illuminated by said beam.
Claim 2
Dependent Claim
170 words
A turbidimeter comprising, in combination, a chamber for receiving and containing fluid, said chamber having a wall with an elongated opening therein, a thick transparent block sealed over said opening, a light source for directing a beam of light into an edge of said block so that the beam is refracted into the fluid through said opening at a small angle from from the plane of the block, and a light sensing cell positioned above said block to receive light reflected by turbidity particles illuminated in the fluid by said beam, said light sensing cell being adjustable from a position to receive reflected light coming from the region immediately adjacent the block-fluid interface so that high turbidities can be measured with no tendency for the instrument to go blind to a position to receive reflected light coming from a region where said beam is spaced from said block so that low turbidities can be measured with no reflection to the cell from portions of the block illuminated by said beam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |