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US5265474A
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Static electricity resistant accelerometer proof mass
Assignee: Boeing North American Inc
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Filing: 1991-07-11
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Granted: 1993-11-30
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Expires: 2011-07-11
Abstract
Abstract Static electric charges are removed from the proof mass 10 and support 12 of an accelerometer by covering the proof mass 10 and support 12 with a thin metallic film 36, such as chromium oxide.
Inventors
- 👤 Herbert G. Chaffin
- 👤 Gordon S. Norvell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:57
CPC Classifications
H; H05; H05F; H05F3/00; G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/125; G01P15/13; G01P15/132; G01P2015/0805; G01P2015/0822; G01P2015/0825; G01P2015/0828
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A static electricity resistant proof mass for an accelerometer, the accelerometer including a differential amplifier, the proof mass comprising: (a) a dielectric non-magnetic center having an upper surface, a lower surface, and a side surface; (b) an upper pickoff plate on the upper surface and connected to the differential amplifier; (c) a lower pickoff plate on the lower surface; and (d) a metal oxide conductive layer on the side surface and connected to the differential amplifier, in contact with the pickoff plates, the conductive layer being attached to a conductor which ultimately leads through a resistance to ground, and the conductive layer having an impedance between the pickoff plates which is large in comparison to the impedance through the differential amplifier.
Claim 2
Dependent Claim
121 words
A static electricity resistant proof mass for an accelerometer, the accelerometer including a differential amplifier, the proof mass comprising: (a) a dielectric non-magnetic center having an upper surface, a lower surface, and a side surface; (b) an upper pickoff plate on the upper surface and connected to the differential amplifier; (c) a lower pickoff plate on the lower surface; and (d) a metal oxide conductive layer on the side surface and connected to the differential amplifier, in contact with the pickoff plates, the conductive layer being attached to a conductor which ultimately leads through a resistance to ground, and the conductive layer having an impedance between the pickoff plates which is large in comparison to the impedance through the differential amplifier.
Claim 3
Dependent Claim
13 words
The proof mass of claim 1, wherein the metal oxide comprises chromium oxide.
Claim 4
Dependent Claim
101 words
The proof mass of claim 1, further comprising: (a) a metal oxide conductive layer on the upper pickoff plate, the conductive layer being attached to a conductor with ultimately leads through a resistance to ground, and the conductive layer having an impedance which is large in comparison to the impedance through the differential amplifier; and (b) a metal oxide conductive layer on the lower pickoff plate, the conductive layer being attached to a conductor which ultimately leads through a resistance to ground, and the conductive layer having an impedance which is large in comparison to the impedance through the differential amplifier.
Claim 5
Dependent Claim
13 words
The proof mass of claim 3, wherein the metal oxide comprises chromium oxide.
Claim 6
Dependent Claim
134 words
A static electricity resistant proof mass for an accelerometer, the accelerometer including a differential amplifier, the proof mass comprising: (a) a dielectric non-magnetic center having an upper surface, a lower surface, and a side surface; (b) a metal oxide conductive layer on the upper surface, lower surface, and side surface, the conductive layer being attached to a conductor which ultimately leads through a resistance to ground (c) an upper pickoff plate on a portion of the conductive layer on the upper surface and connected to the differential amplifier; and (d) a lower pickoff plate on a portion of the conductive layer on the lower surface and connected to the differential amplifier; wherein the conductive layer has an impedance between the pickoff plates which is large in comparison to the impedance through the differential amplifier.
Claim 7
Dependent Claim
134 words
A static electricity resistant proof mass for an accelerometer, the accelerometer including a differential amplifier, the proof mass comprising: (a) a dielectric non-magnetic center having an upper surface, a lower surface, and a side surface; (b) a metal oxide conductive layer on the upper surface, lower surface, and side surface, the conductive layer being attached to a conductor which ultimately leads through a resistance to ground (c) an upper pickoff plate on a portion of the conductive layer on the upper surface and connected to the differential amplifier; and (d) a lower pickoff plate on a portion of the conductive layer on the lower surface and connected to the differential amplifier; wherein the conductive layer has an impedance between the pickoff plates which is large in comparison to the impedance through the differential amplifier.
Claim 8
Dependent Claim
13 words
The proof mass of claim 5, wherein the metal oxide comprises chromium oxide.
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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |