US4721840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated resistance welding sensor
Assignee: MRT ACQUISITION Corp A DELAWARE CORP
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Filing: 1986-01-17
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Granted: 1988-01-26
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Expires: 2006-01-17
Abstract
Abstract The Hall effect current sensor is dipped in a coating of magnetically saturable and electromagnetically saturable material, such as a mixture of powdered nickel in an epoxy binder. The coating has little effect on the sensor's ability to sense the magnetic field attributable to current flow in the welding transformers primary or secondary. The coating shields the Hall effect device from potentially damaging electromagnetic radiation which is produced by the welding apparatus as a by-product of the welding operation.
Inventors
- 👤 Ralph H. Fielding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:27
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/20; G01R15/202
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
101 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and magnetically saturable coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 2
Dependent Claim
101 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and magnetically saturable coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 3
Dependent Claim
19 words
The sensor of claim 1 wherein the magnetically saturable coating means comprises a material with nonlinear magnetic saturation characteristics.
Claim 4
Dependent Claim
100 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferromagnetic coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 5
Dependent Claim
100 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferromagnetic coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 6
Dependent Claim
100 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferrimagnetic coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 7
Dependent Claim
100 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferrimagnetic coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 8
Dependent Claim
102 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and magnetically saturable coating means on said device for absorbing at least a portion of said electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 9
Dependent Claim
102 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and magnetically saturable coating means on said device for absorbing at least a portion of said electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 10
Dependent Claim
93 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferromagnetic coating on said device, said coating having minimal magnetic flux conduction at magnetic field strengths below a predetermined critical point and having substantial magnetic flux conduction at magnetic field strengths above said critical point.
Claim 11
Dependent Claim
93 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and ferromagnetic coating on said device, said coating having minimal magnetic flux conduction at magnetic field strengths below a predetermined critical point and having substantial magnetic flux conduction at magnetic field strengths above said critical point.
Claim 12
Dependent Claim
101 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and electromagnetically saturable coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 13
Dependent Claim
101 words
A sensor for measuring current in a current carrying component of a resistance welding apparatus which radiates intense electromagnetic energy as a by-product of the welding operation, comprising: Hall effect device for sensing the magnetic field produced by a current; means for positioning said device in the magnetic field of said current in said current carrying component; and electromagnetically saturable coating means on said device for shielding said device from said intense electromagnetic energy while permitting magnetic fields from said current carrying component to be sensed by the Hall effect device, and thereby substantially preventing said energy from damaging said device.
Claim 14
Dependent Claim
19 words
The sensor of claim 7 wherein the electromagnetically saturable coating means comprises a material with nonlinear electromagnetic saturation characteristics.
Claim 15
Independent Claim
54 words
A method of making a resistance welding current sensor, comprising: providing a Hall effect device; coating said Hall effect device with a saturable magnetic coating; and providing a means for positioning said coated device in a resistance welding apparatus where said device can receive magnetic energy from a current carrying component of said apparatus.
Claim 16
Independent Claim
54 words
A method of making a resistance welding current sensor, comprising: providing a Hall effect device; coating said Hall effect device with a saturable magnetic coating; and providing a means for positioning said coated device in a resistance welding apparatus where said device can receive magnetic energy from a current carrying component of said apparatus.
Claim 17
Dependent Claim
44 words
The method of claim 9 wherein the step of coating said Hall effect device further comprises the step of dipping the Hall effect device into a liquid material with nonlinear magnetic saturation characteristics which then hardens and adheres to the entire Hall effect device.
Claim 18
Independent Claim
51 words
A method of sensing current in a resistance welding system, comprising: providing a Hall effect device; coating said Hall effect device with a saturable magnetic coating; and positioning said coated device in a resistance welding apparatus where said device can receive magnetic energy from a current carrying component of said apparatus.
Claim 19
Independent Claim
51 words
A method of sensing current in a resistance welding system, comprising: providing a Hall effect device; coating said Hall effect device with a saturable magnetic coating; and positioning said coated device in a resistance welding apparatus where said device can receive magnetic energy from a current carrying component of said apparatus.
Claim 20
Dependent Claim
44 words
The method of claim 10 wherein the step of coating said Hall effect device further comprises the step of dipping the Hall effect device into a liquid material with nonlinear magnetic saturation characteristics which then hardens and adheres to the entire Hall effect device.
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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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |