US4975686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for detecting pulses due to electrostatic discharges from furniture or human beings
Assignee: Individual
•
Filing: 1989-11-14
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Granted: 1990-12-04
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Expires: 2009-11-14
Abstract
Abstract The detection of brief pulses generating high frequencies is carried out by a system including: sensor for detecting an electrostatic field and for detecting an electromagnetic field, such that the variation of the electrostatic field ocurring in a period of time of less than 1 millisecond may be identified. A signal activator for warning about the presence, in an interval of time of less than 1 millisecond, of the variation of the electrostatic field detected and of the electromagnetic field, allowing identification of a pulse due to an electrostatic discharge from furniture or human beings. The invention is applicable to the detection of pulses due to electrostatic discharges.
Inventors
- 👤 Gilles Delcourt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:52
CPC Classifications
G; G01; G01W; G01W1/00; G01W1/16; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; G01R29/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A process for detecting pulses, of the type of which an electromagnetic field and an electrostatic field are detected, comprising the steps of: detecting the electromagnetic field and the electrostatic field within a predefined location; detecting the electromagnetic field using a high pass filter of which the cut-off frequency lies between approximately 15 MHz and 200 MHz inclusive; detecting a variation of the electrostatic field, said variation having a duration less than one millisecond; and producing a warning signal when the variation of the electrostatic field and the presence of the electromagnetic field are both detected within an interval of time less than one millisecond of each other.
Claim 2
Dependent Claim
108 words
A process for detecting pulses, of the type of which an electromagnetic field and an electrostatic field are detected, comprising the steps of: detecting the electromagnetic field and the electrostatic field within a predefined location; detecting the electromagnetic field using a high pass filter of which the cut-off frequency lies between approximately 15 MHz and 200 MHz inclusive; detecting a variation of the electrostatic field, said variation having a duration less than one millisecond; and producing a warning signal when the variation of the electrostatic field and the presence of the electromagnetic field are both detected within an interval of time less than one millisecond of each other.
Claim 3
Dependent Claim
26 words
The process as claimed in claim 1, wherein the warning signal is only produced if said electromagnetic field at least equals about one ampere per meter.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1, wherein the presence of the electromagnetic field is detected by detecting its electric field component.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 1, wherein the presence of the electromagnetic field is detected by detecting its magnetic field component.
Claim 6
Independent Claim
97 words
An apparatus for detecting pulses of the type of which an electromagnetic field and the electrostatic field are detected, comprising: a sensor for detecting an electrostatic field; a detector for detecting an electromagnetic field; a means for detecting a variation of the electrostatic field having a duration less than one millisecond; and a means responsive to both said electrostatic field sensor and said electromagnetic field sensor for producing a warning signal when the variation of the electrostatic field and the presence of the electromagnetic field are both detected within an interval of time less than one millisecond.
Claim 7
Independent Claim
97 words
An apparatus for detecting pulses of the type of which an electromagnetic field and the electrostatic field are detected, comprising: a sensor for detecting an electrostatic field; a detector for detecting an electromagnetic field; a means for detecting a variation of the electrostatic field having a duration less than one millisecond; and a means responsive to both said electrostatic field sensor and said electromagnetic field sensor for producing a warning signal when the variation of the electrostatic field and the presence of the electromagnetic field are both detected within an interval of time less than one millisecond.
Claim 8
Dependent Claim
48 words
The apparatus as claimed in claim 5, further comprising means for detecting when the electromagnetic field at least equals about one ampere per meter and for providing an enabling signal to said warning signal producing means only when said electromagnetic field at least equals one ampere per meter.
Claim 9
Dependent Claim
59 words
The apparatus as claimed in claim 6, further comprising a circuit for receiving a signal issuing from said means for detecting when said electromagnetic field at least equals one ampere per meter, and for providing an enabling signal for said warning signal producing means for no longer than one millisecond after said electrostatic sensor detects said electrostatic field variation.
Claim 10
Dependent Claim
27 words
The apparatus as claimed in claim 5, wherein said warning signal producing means means further comprises means for recording the fact of issuance of said warning signal.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |