US4779451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring foreign materials in liquid
Assignee: Hitachi Ltd
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Filing: 1987-02-13
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Granted: 1988-10-25
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Expires: 2007-02-13
Abstract
Abstract A system for measuring a foreign material in a liquid, includes a sampling section, vacuum deaerators, foreign material measuring sensors. The sampling section prepares a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers. The vacuum deaerators deaerate gases mixed in the sample and calibration standard liquids. The sensors detect the foreign materials in the deaerated liquids. These sensors are arranged in front of the deaerators, respectively.
Inventors
- 👤 Masayoshi Ezawa
- 👤 Shigeru Wakana
- 👤 Akira Misumi
- 👤 Yoshifumi Tomita
- 👤 Yutaka Hiratsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:18
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/036; G01N15/00; G01N15/06; G01N2015/0042; G01N2015/0053; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N2021/054; G01N21/84; G01N21/85
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A system for measuring a foreign material in a liquid, comprising: sampling means for preparing a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers; foreign material measuring means for measuring the foreign materials contained in the sample liquid; inorganic ion measuring means for measuring inorganic ions contained in the sample liquid; and vacuum deaerating means respectively arranged in front of sensors of said foreign material measuring means.
Claim 2
Independent Claim
84 words
A system for measuring a foreign material in a liquid, comprising: sampling means for preparing a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers; foreign material measuring means for measuring the foreign materials contained in the sample liquid; inorganic ion measuring means for measuring inorganic ions contained in the sample liquid; and vacuum deaerating means respectively arranged in front of sensors of said foreign material measuring means.
Claim 3
Dependent Claim
36 words
A system according to claim 1, wherein each of said vacuum deaerating means comprises one of an organic film vacuum deaerator, a vacuum spray deaerator, and a combination of a vacuum chamber and a vacuum device.
Claim 4
Dependent Claim
31 words
A system according to claim 2, wherein each of said vacuum deaerating means deaerates 1 to 100 ppm of a gas flow supplied at a rate of 20 to 1000 ml/min.
Claim 5
Independent Claim
101 words
A system for measuring a foreign material in a liquid, comprising: sampling means for preparing a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers; foreign material measuring means for detecting the foreign materials contained in the sample liquid; inorganic ion measuring means for measuring inorganic ions contained in the sample liquid; an ultrasonic generator for accelerating separation of foreign materials from an object subjected to cleaning in the sample liquid; and vacuum deaerating means respectively arranged in front of sensors of said measuring means.
Claim 6
Independent Claim
101 words
A system for measuring a foreign material in a liquid, comprising: sampling means for preparing a sample liquid containing various foreign materials having particles of different sizes and numbers and a calibration standard liquid containing particles of known sizes and numbers; foreign material measuring means for detecting the foreign materials contained in the sample liquid; inorganic ion measuring means for measuring inorganic ions contained in the sample liquid; an ultrasonic generator for accelerating separation of foreign materials from an object subjected to cleaning in the sample liquid; and vacuum deaerating means respectively arranged in front of sensors of said measuring means.
Claim 7
Dependent Claim
36 words
A system according to claim 4, wherein each of said vacuum deaerating means comprises one of an organic film vacuum deaerator, a vacuum spray deaerator, and a combination of a vacuum chamber and a vacuum device.
Claim 8
Dependent Claim
31 words
A system according to claim 5, wherein each of said vacuum deaerating means deaerates 1 to 100 ppm of a gas flow supplied at a rate of 20 to 1000 ml/min.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |