Pipe joints or couplings – With means blocking release of holding means – Key or pin
Patent
1995-12-07
1998-06-30
Fridie, Jr., Willmon
Pipe joints or couplings
With means blocking release of holding means
Key or pin
283 72, B42D 1500
Patent
active
057722480
ABSTRACT:
A tamper and counterfeit resistant security maker comprises relief impressions having a plurality of distinct and contrasting relief structures, wherein a first relief structure comprises a background pattern and at least a second relief structure comprises a latent image pattern containing informational content. The relief patterns comprise different optical properties which facilitates the viewing of a latent image pattern at certain angles.
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Fridie Jr. Willmon
Verify First Technologies, Inc.
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