US4299495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Density meter
Assignee: Toshiba Corp
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Filing: 1980-05-16
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Granted: 1981-11-10
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Expires: 2000-05-16
Abstract
Abstract A density meter which is immersed in a liquid to be measured to optically measure the degree of opacity thereof is disclosed. The meter comprises a density measurement system in which the liquid is sucked into a transparent inner cylinder by moving a piston upwardly and the transmittance of the liquid is measured by an optical system provided outside the transparent inner cylinder, and a calibration system in which a calibration liquid flow path is formed. The outlet of the calibration liquid flow path is communicated with the transparent inner cylinder, and the outlet is above a position at which the end of the piston is set during density measurement. In calibration, the piston is raised to a position higher than the position of the outlet to introduce a calibration liquid into the inner cylinder to calibrate the density meter by the optical system.
Inventors
- 👤 Akira Sawakata
- 👤 Hiroshi Yamamuro
- 👤 Syouzou Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:27
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; G01N21/8507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A density meter adapted to be immersed in a liquid whose degree of opacity is to be optically measured, comprising: a density measurement system including a hollow inner cylinder having an inlet, a piston movable in said cylinder and an optical system externally associated with said cylinder at a first distance from said inlet; and a calibration system comprising a calibration liquid flow path having an outlet communicating with said cylinder at a point on said cylinder having a second distance from said inlet greater than said first distance, whereby said calibration system is activated by raising said piston to a position further from said inlet than said second distance.
Claim 2
Dependent Claim
110 words
A density meter adapted to be immersed in a liquid whose degree of opacity is to be optically measured, comprising: a density measurement system including a hollow inner cylinder having an inlet, a piston movable in said cylinder and an optical system externally associated with said cylinder at a first distance from said inlet; and a calibration system comprising a calibration liquid flow path having an outlet communicating with said cylinder at a point on said cylinder having a second distance from said inlet greater than said first distance, whereby said calibration system is activated by raising said piston to a position further from said inlet than said second distance.
Claim 3
Dependent Claim
14 words
The meter of claim 1 including a plurality of said calibrating liquid flow paths.
Claim 4
Dependent Claim
31 words
The meter of claim 1 wherein said inlet is located on a plate covering one end of said cylinder, the diameter of said inlet being less than that of said cylinder.
Claim 5
Dependent Claim
14 words
The meter of claim 1 wherein said calibrating liquid flow path includes heater means.
Claim 6
Independent Claim
111 words
A method for optically measuring the density of a liquid, comprising: immersing a hollow inner cylinder having an inlet at one end into the liquid to be measured; moving a piston in said cylinder away from said inlet to draw said liquid into said cylinder; utilizing an optical system externally associated with said cylinder at a first distance from said inlet to measure the degree of opacity of said liquid; and calibrating said meter after a predetermined period of time by further moving said piston away from said inlet beyond the outlet of a calibration liquid flow path, whereby the calibration liquid in said calibration liquid flow path fills said cylinder.
Claim 7
Independent Claim
111 words
A method for optically measuring the density of a liquid, comprising: immersing a hollow inner cylinder having an inlet at one end into the liquid to be measured; moving a piston in said cylinder away from said inlet to draw said liquid into said cylinder; utilizing an optical system externally associated with said cylinder at a first distance from said inlet to measure the degree of opacity of said liquid; and calibrating said meter after a predetermined period of time by further moving said piston away from said inlet beyond the outlet of a calibration liquid flow path, whereby the calibration liquid in said calibration liquid flow path fills said cylinder.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |