US4679643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive weighing device
Assignee: Advanced Micro Electronic Components and Systems NV
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Filing: 1986-01-17
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Granted: 1987-07-14
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Expires: 2006-01-17
Abstract
Abstract There is described a device, comprised of a frame or substructure, four arms arranged in cross shape or substantially in cross shape and hingedly supported on knife-edge in said frame, a weighing plate vertically movable relative to said frame, bearing through knife-edges on said arms, in notches provided therefor in the arms, in which said arms bear with the mutually-facing ends thereof on a box-design sensor, whereby the sensor capacity is changed proportionally to that force being exerted on said weighing plate, and in which said sensor is formed by a box-like holder with a bottom whereon a first insulated armature which acts as lowermost capacitive plate, is firmly secured.
Inventors
- 👤 Bertrand Bove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
G; G01; G01G; G01G7/00; G01G7/06; G01G19/00; G01G19/44; G01G21/00; G01G21/23
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
159 words
Capacitive weighing device, comprised of a frame or substructure, four arms arranged in cross shape or substantially in cross shape and hingedly supported on knife-edges in said frame, a weighing plate vertically movable relative to said frame, bearing through knife-edges on said arms, in notches provided therefor in the arms, in which said arms bear with the mutually-facing ends thereof on a spring plate, wherewith an armature or upmost capacitive plate is insulatedly connected, said spring plate bearing with the one end thereof on one upstanding side from a box-like holder with a bottom whereon a metal film which acts as a lowermost capacitive plate is insulatedly fixed, and bearing with the opposite end thereof on an upstanding knife-edge, said knife-edge being supported in two slots provided in the bottom, in such a way that during a weighing operation, said knife-edge may slightly swing and always form substantially the same angle with the spring plate bearing on said knife-edge.
Claim 2
Dependent Claim
159 words
Capacitive weighing device, comprised of a frame or substructure, four arms arranged in cross shape or substantially in cross shape and hingedly supported on knife-edges in said frame, a weighing plate vertically movable relative to said frame, bearing through knife-edges on said arms, in notches provided therefor in the arms, in which said arms bear with the mutually-facing ends thereof on a spring plate, wherewith an armature or upmost capacitive plate is insulatedly connected, said spring plate bearing with the one end thereof on one upstanding side from a box-like holder with a bottom whereon a metal film which acts as a lowermost capacitive plate is insulatedly fixed, and bearing with the opposite end thereof on an upstanding knife-edge, said knife-edge being supported in two slots provided in the bottom, in such a way that during a weighing operation, said knife-edge may slightly swing and always form substantially the same angle with the spring plate bearing on said knife-edge.
Claim 3
Dependent Claim
24 words
Capacitive weighing device as defined in claim 1, in which said upstanding side and said knife-edge comprise an integral part of said spring plate.
Claim 4
Dependent Claim
26 words
Capacitive weighing device as defined in claim 1 or 2, in which said spring plate bears on said knife-edge through the use of a knife seat.
Claim 5
Dependent Claim
25 words
Capacitive weighing device as defined in any one of claims 1-3 in which said knife-edge bears by means of a knife seat in said slots.
Claim 6
Dependent Claim
25 words
Capacitive weighing device as defined in any one of claims 1-4, in which the upstanding side and said knife-edge are integral with said spring plate.
Claim 7
Dependent Claim
23 words
Capacitive weighing device as defined in any one of claims 1-5, in which said spring plate forms a single unit with said knife-edge.
Claim 8
Dependent Claim
32 words
Capacitive weighing device as defined in any one of claims 1-5, in which said spring plate is machined along both sides to a knife-edge wherewith said spring plate bears on the bottom.
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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |