Patent US4862729A successfully refreshed from Google Patents.
US4862729A
Expired / Lapsed
US
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Method for measuring the amount of gas contained in liquid
Assignee: POLYURETHAN ENGINEERING KK
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Filing: 1988-07-13
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Granted: 1989-09-05
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Expires: 2008-07-13
Abstract
Abstract A method for measuring the amount of the gas contained in liquid, comprising introducing a liquid material into a vacuum measuring chamber, changing the volume of the measuring chamber to provide two different liquid pressures of the liquid material in the measuring chamber, detecting the different pressures to measure the amount of gas on the basis of Boyle's law.
Inventors
- 👤 Kenichi Toda
- 👤 Tetsuhiro Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:17
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
An apparatus for measuring the amount of gas contained in a liquid material comprising: (1) a cylindrical measuring chamber (10); (2) an inlet part (9,13) connecting said measuring chamber to a sample source; (3) a valve device (20) comprising means for closing said measuring chamber from said inlet part; (4) a piston (31) fitted into said measuring chamber (10); (5) a first means for moving said piston a predetermined distance in said measuring chamber said comprising at least two cylindrical ports separated by a seal member on said piston, said cylinder ports being positioned so that said first means effects movement of said piston over the length of said measuring chamber; (6) a pressure gauge (15) connected to said measuring chamber; (7) a second means for moving said piston a predetermined distance in said measuring chamber; and (8) means for detecting the location of said valve means and said piston.
Claim 2
Independent Claim
150 words
An apparatus for measuring the amount of gas contained in a liquid material comprising: (1) a cylindrical measuring chamber (10); (2) an inlet part (9,13) connecting said measuring chamber to a sample source; (3) a valve device (20) comprising means for closing said measuring chamber from said inlet part; (4) a piston (31) fitted into said measuring chamber (10); (5) a first means for moving said piston a predetermined distance in said measuring chamber said comprising at least two cylindrical ports separated by a seal member on said piston, said cylinder ports being positioned so that said first means effects movement of said piston over the length of said measuring chamber; (6) a pressure gauge (15) connected to said measuring chamber; (7) a second means for moving said piston a predetermined distance in said measuring chamber; and (8) means for detecting the location of said valve means and said piston.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1 wherein said valve device comprises a housing having a cylindrical bore and a tubular member slidably disposed therein.
Claim 4
Dependent Claim
52 words
An apparatus according to claim 1 wherein said second means for moving said piston comprises a cylinder (45) disposed at a base of said piston, a chamber (40a) at the base thereof, an inlet and an outlet connected to said chamber, and a stop (46) which limits the travel of said cylinder.
References Cited (Backward Citations)
US2138141A
Cited
US2680060A
Cited
US2798690A
Cited
US2817955A
Cited
US3521478A
Cited
US3731530A
Cited
US3968678A
Cited
US4120192A
Cited
US4164137A
Cited
US4255088A
Cited
US4329869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |