Metering apparatus with tamper detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 7, 1999
Grant Date -
N/A
app pub date -
Jul 18, 1997
filing date -
Jul 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus, for example postage metering apparatus is described as being provided with tamper detection means. The tamper detection means may comprise an electrically conductive or resistive first layer extending between a wall of a secure housing and components critical in the proper functioning of the apparatus. An indicator may include a second electrically conductive layer extending adjacent and electrically isolated from the first layer and means responsive to completion of an electrical path between the layers or means responsive to change in resistance of the resistive layer. In an alternative construction, the tamper detection means includes a sealed enclosed space containing gaseous substance at a pressure above ambient air pressure and means responsive to a decrease in the pressure in the space to permit a mechanical interposer to engage an operable mechanical element of the apparatus to inhibit operation thereof.
First Claim
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- G08B Class
- 2.65 % this patent is cited more than
- 26 Age