Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1980-02-07
1982-01-26
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
200 46, 209534, G01R 2702
Patent
active
043130879
ABSTRACT:
This apparatus tests the genuineness of a document carrying anticounterfeit protection in the form of a usually invisible, electrically conductive coating on at least part of a surface. The apparatus may be arranged to respond to the presence of a coating anywhere on the surface, or it may be arranged to respond only to a coating of specific contour, in a specific location. The apparatus shown comprises an array of contacts and means for supporting a document to be tested in conductive engagement with said contacts. Certain ones of the contacts engage the conductive layer, and are connected in an electric circuit which is completed through the conductive layer. Completion of the circuit is required to produce an indication that the document is genuine. The conductance of the conductive layer must be within a predetermined range in order to produce a signal indicating that the document is genuine. The contacts which engage areas of the document where there should be no conductive layer, may be connected in a second circuit which, if completed through a conductive layer, prevents the production of a signal indicating that the document is genuine.
REFERENCES:
patent: 1573174 (1926-02-01), Lasker, Jr.
patent: 1997157 (1935-04-01), Tauschek
patent: 2377783 (1945-06-01), Hood
patent: 2690300 (1954-09-01), Wilson
patent: 3000498 (1961-09-01), Cooping
patent: 3043993 (1962-07-01), Maltby
patent: 3220549 (1965-11-01), Wong
patent: 3362532 (1968-01-01), Riddle et al.
patent: 3678251 (1972-07-01), Delpino
patent: 3818335 (1974-06-01), Stungis et al.
patent: 4044229 (1977-08-01), Samreus
patent: 4195772 (1980-04-01), Nishimura
patent: 4255652 (1981-03-01), Weber
D'Amato Salvatore F.
Weitzen Edward H.
LandOfFree
Apparatus for detecting electrically conductive coatings on docu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for detecting electrically conductive coatings on docu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting electrically conductive coatings on docu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1668235