US4821320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting electrical apparatus and the operator when the operator carries a high electrostatic charge
Assignee: Siemens AG
•
Filing: 1987-05-26
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Granted: 1989-04-11
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Expires: 2007-05-26
Abstract
Abstract A device for protecting both the operator of an electronic apparatus and the electronic equipment of the apparatus when the operator carries a high electrostatic charge. To ensure a gentle electrostatic discharge of the operator, resistance paths which lead to an ground point of the electronic apparatus are arranged in the danger zone of the apparatus.
Inventors
- 👤 Tomas J. Andert
- 👤 Stefan Pieper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:00
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/14; H; H04; H04M; H04M1/00; H04M1/02; H04M1/03; H05; H05F; H05F3/00; H05F3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
Apparatus for protecting an operator who contacts a telephone apparatus handset arranged in an insulated housing including at least first and second housing components and for protecting electronic devices which comprise the telephone apparatus, in the event the operator carries a high electrostatic charge, comprising: at least one resistive contact path having a relatively appreciable ohmic resistance (e.g., in the megohm range) and arranged proximate an outer part of said insulating housing which is touched by the operator, wherein a first end of said resistive contact path is arranged between said housing components and located in the region of said electronic devices and a second end of said resistive contact path terminates at a low potential point of the handset.
Claim 2
Dependent Claim
120 words
Apparatus for protecting an operator who contacts a telephone apparatus handset arranged in an insulated housing including at least first and second housing components and for protecting electronic devices which comprise the telephone apparatus, in the event the operator carries a high electrostatic charge, comprising: at least one resistive contact path having a relatively appreciable ohmic resistance (e.g., in the megohm range) and arranged proximate an outer part of said insulating housing which is touched by the operator, wherein a first end of said resistive contact path is arranged between said housing components and located in the region of said electronic devices and a second end of said resistive contact path terminates at a low potential point of the handset.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1, wherein said resistive contact path consists of graphite.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 1, wherein said resistive contact path consists of a foil inserted between said housing components.
Claim 5
Dependent Claim
146 words
Apparatus for protecting an operator who contacts of a telephone apparatus handset arranged in an insulated housing including at least first and second housing components and for protecting electronic devices which comprise the telephone apparatus, in the event the operator carries a high electrostatic charge, comprising: at least one resistive contact path having a relatively appreciable ohmic resistance (e.g., in the megohm range) and arranged proximate an outer part of said insulating housing which is touched by the operator, wherein said resistive contact path is arranged on one of said housing components in the region of a shadow seam formed between said housing components, and has a first end which is located in the region of said electronic devices and a second end which leads via a pressure-contact connection to a point of the other one of said housing components which includes a low potential point.
Claim 6
Dependent Claim
146 words
Apparatus for protecting an operator who contacts of a telephone apparatus handset arranged in an insulated housing including at least first and second housing components and for protecting electronic devices which comprise the telephone apparatus, in the event the operator carries a high electrostatic charge, comprising: at least one resistive contact path having a relatively appreciable ohmic resistance (e.g., in the megohm range) and arranged proximate an outer part of said insulating housing which is touched by the operator, wherein said resistive contact path is arranged on one of said housing components in the region of a shadow seam formed between said housing components, and has a first end which is located in the region of said electronic devices and a second end which leads via a pressure-contact connection to a point of the other one of said housing components which includes a low potential point.
Claim 7
Dependent Claim
13 words
Apparatus according to claim 4, wherein said resistive contact path consists of graphite.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 4, wherein said resistive contact path consists of a foil inserted between said housing components.
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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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |