US4644662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive gravity sensor
Assignee: SCHAEVITZ SENSING SYSTEM Inc
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Filing: 1986-04-29
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Granted: 1987-02-24
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Expires: 2006-04-29
Abstract
Abstract An inclinometer includes two coplanar electrodes positioned within a chamber of a metallic housing containing a high relative dielectric constant fluid and a gas. With the inclinometer positioned on a level surface equal areas of the two electrodes are immersed in the dielectric fluid creating two equal capacitors formed by the electrodes and the metallic housing. When the inclinometer is rotated through an inclination angle, unequal areas of the electrodes are immersed in the fluid causing a capacitance differential that is a measure of the inclination angle.
Inventors
- 👤 Jane E. Anderson
- 👤 Harold L. Swartz
- 👤 Mario DiMarco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:23
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/02; G01C9/06; G01C9/18; G01C9/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
247 words
An inclinometer comprising: a housing having a fluid container therewithin formed by first and second metallic outer walls and a metallic perimeter; a first sheet of dielectric material positioned within said fluid container at a preselected distance from said first metallic outer wall to form a first fluid chamber bounded by said first sheet of dielectric material, said first metallic outer wall, and said metallic perimeter; a second sheet of dielectric material positioned within said fluid container in a parallel relationship with said first sheet of dielectric material at a distance from said second metallic outer wall that is equal to said preselected distance to form a second fluid chamber bounded by said second sheet of dielectric material, said second metallic outer wall, and said metallic perimeter; first and second coplanar, electrically decoupled, metallic sensor plates positioned in a plane located between said first and second sheets of dielectric material to form a laminated disk, said first and second metallic sensor plates being completely covered by said first and second sheets of dielectric material, said first and second metallic sensor plates having a separation distance therebetween to provide a metal free region in said plane defining an area having a predetermined length; a fluid, having a preselected dielectric constant, contained in said first and second fluid chambers at equal predetermined levels; and a gas having a dielectric constant less than said preselected dielectric constant filling areas in said first and second fluid chambers not containing said fluid.
Claim 2
Dependent Claim
247 words
An inclinometer comprising: a housing having a fluid container therewithin formed by first and second metallic outer walls and a metallic perimeter; a first sheet of dielectric material positioned within said fluid container at a preselected distance from said first metallic outer wall to form a first fluid chamber bounded by said first sheet of dielectric material, said first metallic outer wall, and said metallic perimeter; a second sheet of dielectric material positioned within said fluid container in a parallel relationship with said first sheet of dielectric material at a distance from said second metallic outer wall that is equal to said preselected distance to form a second fluid chamber bounded by said second sheet of dielectric material, said second metallic outer wall, and said metallic perimeter; first and second coplanar, electrically decoupled, metallic sensor plates positioned in a plane located between said first and second sheets of dielectric material to form a laminated disk, said first and second metallic sensor plates being completely covered by said first and second sheets of dielectric material, said first and second metallic sensor plates having a separation distance therebetween to provide a metal free region in said plane defining an area having a predetermined length; a fluid, having a preselected dielectric constant, contained in said first and second fluid chambers at equal predetermined levels; and a gas having a dielectric constant less than said preselected dielectric constant filling areas in said first and second fluid chambers not containing said fluid.
Claim 3
Dependent Claim
13 words
An inclinometer in accordance with claim 1 wherein said dielectric material is polyester.
Claim 4
Dependent Claim
44 words
An inclinometer in accordance with claim 1 wherein said laminated disk contains holes therethrough for linking said first and second fluid chambers to provide passages for said fluid and said gas to equalize gas and fluid pressure between said first and second fluid chambers.
Claim 5
Dependent Claim
102 words
An inclinometer in accordance with claim 3 further including a metallic partition extending from at least one of said first and second metallic walls of said housing towards said plane for a distance that is not greater than said preselected distance and positioned such that an imaginary geometric projection of said metallic partition in said plane is in said metal free region between said first and second metallic sensor plates, said metallic partition having a length equal to said predetermined length of said area in said metal free region and having fluid passages therein aligned with said holes in said laminated disk.
Claim 6
Dependent Claim
24 words
An inclinometer in accordance with claim 1 wherein said gas is nitrogen and said fluid comprises a mixture of a hydrocarbon and an alcohol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |