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US 2,534,846 A
Filed
: 09/08/1947
Issued
: 12/19/1950
Est. Priority Date
: 06/20/1946
Status: Expired due to Term
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Petitions
214
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Current Assignee
Gerard Salmon Joseph
,
Jack Ambrose Edmund
,
John Pacey Derek
Original Assignee
Gerard Salmon Joseph
,
Jack Ambrose Edmund
,
John Pacey Derek
Inventors
JACK AMBROSE EDMUND
,
JOHN PACEY DEREK
,
GERARD SALMON JOSEPH
Application Number
US02/772,602
Time in Patent Office
1,198 Days
Field of Search
US Class Current
348/270
CPC Class Codes
G02B 26/001
based on interference in an...
G02B 5/284
of etalon type comprising a...
G02F 1/21
by interference
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