Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Reexamination Certificate
2007-02-20
2007-02-20
Berman, Jack (Department: 2881)
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
C250S42300F, C250S372000, C313S494000, C313S324000, C324S464000
Reexamination Certificate
active
11093992
ABSTRACT:
A photoionization detector includes a housing, electrical contacts within the housing and an easily removable and replaceable photoionization chamber within the housing. The photoionization chamber includes a cathodic electrode and an anodic electrode which may be coated with a thin layer of material. The photoionization chamber and the associated cathodic electrode and anodic electrode are removable from within the housing as a unit. The photoionization chamber makes electrical connection with the contacts when seated within the housing regardless of the orientation of the photoionization chamber about an axis.
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Bruce Daniel E.
Cahall James A.
Haverstick Jon K.
Miller James B.
Schulman Michael B.
Bartony, Jr. Henry E.
Berman Jack
Hashmi Zia R.
Mine Safety Appliances Company
Uber James G.
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