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INFRARED-EXCITABLE YTTERBIUM SENSITIZED ERBIUM OR THULIUM ACTIVATED RARE EARTH FLOURIDE LUMINESCENT MATERIAL
US 3,541,018 A
Filed
: 09/18/1968
Issued
: 11/17/1970
Est. Priority Date
: 09/18/1968
Status: Expired due to Term
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Current Assignee
Twister Tube Limited
Original Assignee
James F. Sarver
,
Ralph A. Hewes
Inventors
Hewes, Ralph A.
,
Sarver, James F.
Application Number
US04/767,038
Time in Patent Office
790 Days
Field of Search
US Class Current
252/301.40H
CPC Class Codes
C09K 11/7772
Halogenides C09K11/7767 tak...
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