US4909063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure calibration method and apparatus
Assignee: Chesebrough Ponds Inc
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Filing: 1988-10-24
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Granted: 1990-03-20
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Expires: 2008-10-24
Abstract
Abstract A differential pressure calibrator (with built in overrange protection) using a "dropping ball and weight" technique and a mode unit which eliminates the need for a process manifold is disclosed in the subject invention.
Inventors
- 👤 Everett O. Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
G; G01; G01L; G01L27/00; G01L27/002; G01L27/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
Mode unit for use in a differential pressure calibrator apparatus, said mode unit comprising: a housing having a central cavity in said housing; flexible movable diaphragm means located in said central cavity for dividing said central cavity into first and second portions thereof; diaphragm block means divided by said diaphragm, centrally located in said cavity portions; first and second bumper means respectively positioned within said first and second cavity portions, for restraining movement of said diaphragm block means; first and second spring means respectively positioned within said first and second cavity portions, for urging said respective first and second bumper means into contact with said diaphragm block means; first and second electromagnet means respectively associated with said first and second bumper means, for moving each of said bumper means between a normal, unactivated position and an activated, retracted position; fill fluid filling each of said cavity portions; and first and second ports in said housing communicating respectively with said first and second cavity portions.
Claim 2
Dependent Claim
164 words
Mode unit for use in a differential pressure calibrator apparatus, said mode unit comprising: a housing having a central cavity in said housing; flexible movable diaphragm means located in said central cavity for dividing said central cavity into first and second portions thereof; diaphragm block means divided by said diaphragm, centrally located in said cavity portions; first and second bumper means respectively positioned within said first and second cavity portions, for restraining movement of said diaphragm block means; first and second spring means respectively positioned within said first and second cavity portions, for urging said respective first and second bumper means into contact with said diaphragm block means; first and second electromagnet means respectively associated with said first and second bumper means, for moving each of said bumper means between a normal, unactivated position and an activated, retracted position; fill fluid filling each of said cavity portions; and first and second ports in said housing communicating respectively with said first and second cavity portions.
Claim 3
Dependent Claim
15 words
Apparatus as in claim 1, wherein said central cavity is circular in cross-section and elongated.
Claim 4
Dependent Claim
24 words
Apparatus as in claim 1, wherein said diaphragm is generally planar and includes deep-ribbed central portions for facilitating movement thereof perpendicular to said plane.
Claim 5
Dependent Claim
13 words
Apparatus as in claim 1, wherein said diaphragm has a low spring rate.
Claim 6
Dependent Claim
18 words
Apparatus as in claim 1, wherein said diaphragm is made of a material impermeable by said fill fluid.
Claim 7
Dependent Claim
14 words
Apparatus as in claim 1, wherein said diaphragm is made of thin polymeric plastic.
Claim 8
Dependent Claim
11 words
Apparatus as in claim 1, wherein said diaphragm block is non-magnetic.
Claim 9
Dependent Claim
11 words
Apparatus as in claim 1, wherein said bumper means are ferromagnetic.
Claim 10
Dependent Claim
17 words
Apparatus as in claim 1, wherein said cavity first and second portions are substantially equal in volume.
References Cited (Backward Citations)
GB191200274A
Cited
FR453150A
Cited
US4604891A
Cited
US4638656A
Cited
US4708010A
Cited
US4681143A
Cited
JPS61223385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |