US5359319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic discharge detector and display
Assignee: 3M Co
•
Filing: 1990-08-13
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Granted: 1994-10-25
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Expires: 2010-08-13
Abstract
Abstract A detector for detecting electrostatic discharge events in an electronic component, assembly or system and including a display element which produces an immediate indication on exposure to a change in voltage level, an electrostatic discharge sensor, and circuit means for connecting said sensor to said display element. In one embodiment, the detector and the board or other device to be monitored are mounted in a housing having a visual access window with the display element of the detector viewable through the access window and with the detector positioned at the electronic device being monitored.
Inventors
- 👤 Jeffrey D. Campbell
- 👤 Graham O. Gearing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:41
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
In a detector for detecting electrostatic discharge events in an electronic component or assembly device, the combination of: a non-destructive direct reading display element which changes indication on exposure to a change in voltage level; an electrostatic discharge sensor including amplifier means and antenna means; and means for connecting an output of said amplifier means to said display element; said antenna means including first and second antennae, and circuit means for connecting said first antenna and second antenna into said amplifier means for receiving electrostatic discharge events of different polarity.
Claim 2
Dependent Claim
90 words
In a detector for detecting electrostatic discharge events in an electronic component or assembly device, the combination of: a non-destructive direct reading display element which changes indication on exposure to a change in voltage level; an electrostatic discharge sensor including amplifier means and antenna means; and means for connecting an output of said amplifier means to said display element; said antenna means including first and second antennae, and circuit means for connecting said first antenna and second antenna into said amplifier means for receiving electrostatic discharge events of different polarity.
Claim 3
Dependent Claim
16 words
A detector as defined in claim 1 wherein said display element is a liquid crystal display.
Claim 4
Dependent Claim
17 words
A detector as defined in claim 2 wherein said display element is a ferroelectric liquid crystal display.
Claim 5
Dependent Claim
23 words
A detector as defined in claim 2 including means for mounting said sensor and display element directly on the device to be monitored.
Claim 6
Dependent Claim
34 words
A detector as defined in claim 4 wherein said means for mounting includes a housing for said display element and sensor with clip means for attaching said housing to the device to be monitored.
Claim 7
Dependent Claim
30 words
A detector as defined in claim 4 wherein said means for mounting includes a base with said display element on one side and an adhesive layer on the opposite side.
Claim 8
Dependent Claim
34 words
A detector as defined in claim 1 for monitoring the body of a human assembler, with said sensor and display element in a package, and including means for attaching said package to said assembler.
Claim 9
Dependent Claim
24 words
A detector as defined in claim 1 including reset means for resetting said display element to its original state after said change of indication.
Claim 10
Dependent Claim
16 words
A detector as defined in claim 1 wherein said display element is a twisted nematic element.
Claim 11
Dependent Claim
16 words
A detector as defined in claim 1 wherein said display element is a smectic A element.
Claim 12
Dependent Claim
42 words
A detector as defined in claim 1 wherein said display element changes indication from a first state to a second state, and including means for maintaining said element in said second state thereby subsequently indicating the occurrence of an electrostatic discharge event.
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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) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |