US4106342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure measuring apparatus
Assignee: Individual
•
Filing: 1977-04-14
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Granted: 1978-08-15
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Expires: 1997-04-14
Abstract
Abstract There is provided a pressure measuring apparatus, useful as a barometer, comprising a first variable volume vessel containing a gas, said first vessel being extendable and retractable between a first end and a second end thereof, the pressure to be measured acting on said first vessel, a second variable volume vessel containing a substantially incompressible liquid, said second vessel being extendable and retractable between a first and a second end thereof, a means for indicating the pressure acting on said first vessel, a first member joined to said first end of said first vessel and a second member joined to said second end of said first vessel, said first end of said second vessel being joined to open of said members, said second end of said second vessel or said second vessel being joined to the other of said members, said indicating means communicating with the interior of one of said first vessel, said members being relatively movable toward and away from each other in parallel relationship, whereby a temperature induced pressure variation of said gas and a temperature induced volume variation of said liquid compensate each other.
Inventors
- 👤 Onni Sore Sormunen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:44
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/18; G01L7/185; G01L7/02; G01L7/06; G01L7/182; G01L9/00; G01L9/0091; G01L9/0092
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A pressure measuring apparatus, useful as a barometer, comprising a first variable volume vessel containing a gas, said first vessel being extendable and retractable between a first end and a second end thereof, the pressure to be measured acting on said first vessel a second variable volume vessel containing a substantially incompressible liquid, said second vessel being extendable and retractable between a first end and a second end thereof, a riser tube communicating with the interior of said second vessel for indicating the pressure acting on said first vessel, a first member joined to said first end of said first vessel and a second member joined to said second end of said first vessel, said first end of said second vessel being joined to one of said members, said second end of said second vessel being joined to the other of said members, said members being relatively movable toward and away from each other in parallel relationship whereby a temperature induced pressure variation of said gas and a temperature induced volume variation of said liquid compensate each other.
Claim 2
Dependent Claim
178 words
A pressure measuring apparatus, useful as a barometer, comprising a first variable volume vessel containing a gas, said first vessel being extendable and retractable between a first end and a second end thereof, the pressure to be measured acting on said first vessel a second variable volume vessel containing a substantially incompressible liquid, said second vessel being extendable and retractable between a first end and a second end thereof, a riser tube communicating with the interior of said second vessel for indicating the pressure acting on said first vessel, a first member joined to said first end of said first vessel and a second member joined to said second end of said first vessel, said first end of said second vessel being joined to one of said members, said second end of said second vessel being joined to the other of said members, said members being relatively movable toward and away from each other in parallel relationship whereby a temperature induced pressure variation of said gas and a temperature induced volume variation of said liquid compensate each other.
Claim 3
Dependent Claim
53 words
An apparatus as set forth in claim 1 further comprising a scale having scale lines, which are corrected for the deviation between the heat expansion characteristics of said gas and said liquid, said scale being movable transverse to said riser tube and being driven by the heat expansion and retraction of a fluid.
Claim 4
Dependent Claim
46 words
An apparatus as set forth in claim 1 further comprising means for sensing the position of the top of the liquid column in said tube, said sensing means being arranged to emit a signal in response to said position, and a means for recording said signal.
Claim 5
Dependent Claim
187 words
A pressure measuring apparatus, useful as a barometer, comprising a first variable volume vessel containing a gas, said first vessel being extendable and retractable between a first end and a second end thereof, the pressure to be measured acting on said first vessel a second variable volume vessel containing a substantially incompressible liquid, said second vessel being extendable and retractable between a first end and a second end thereof, a substantially horizontal, narrow, open ended tube containing a liquid droplet and communicating with the interior of said first vessel for indicating the pressure acting on said first vessel, a first member joined to said first end of said first vessel and a second member joined to said second end of said first vessel, said first end of said second vessel being joined to one of said members, said second end of said second vessel being joined to the other of said members, said members being relatively movable toward and away from each other in parallel relationship; whereby a temperature induced pressure variation of said gas and a temperature induced volume variation of said liquid compensate each other.
Claim 6
Dependent Claim
187 words
A pressure measuring apparatus, useful as a barometer, comprising a first variable volume vessel containing a gas, said first vessel being extendable and retractable between a first end and a second end thereof, the pressure to be measured acting on said first vessel a second variable volume vessel containing a substantially incompressible liquid, said second vessel being extendable and retractable between a first end and a second end thereof, a substantially horizontal, narrow, open ended tube containing a liquid droplet and communicating with the interior of said first vessel for indicating the pressure acting on said first vessel, a first member joined to said first end of said first vessel and a second member joined to said second end of said first vessel, said first end of said second vessel being joined to one of said members, said second end of said second vessel being joined to the other of said members, said members being relatively movable toward and away from each other in parallel relationship; whereby a temperature induced pressure variation of said gas and a temperature induced volume variation of said liquid compensate each other.
Claim 7
Dependent Claim
41 words
An apparatus as set forth in claim 4 further comprising a scale having scale lines, which are corrected for the deviation between the heat expansion characteristics of said gas and being driven by the heat expansion and retraction of a fluid.
References Cited (Backward Citations)
US3085595A
Cited
US3643510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |