E.F. JOHNSON COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H04W WIRELESS COMMUNICATION NETWORKS 18170
 
  
 
H04B TRANSMISSION 16194
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 10275
 
  
 
H04M TELEPHONIC COMMUNICATION 6157
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 4443
 
  
 
G09G ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION 4147
 
  
 
H04H BROADCAST COMMUNICATION 451
 
  
 
F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR 3107
 
  
 
F21Y INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21L, F21S and F21V, RELATING TO THE FORM OF THE LIGHT SOURCES 332
 
  
 
G06T IMAGE DATA PROCESSING OR GENERATION, IN GENERAL 3132

Top Patents (by citation)

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Recent Publications

Publication # Title Filing Date Pub Date Intl Class
2018/0075,807 CONTROL HEAD WITH ELECTROLUMINESCENT PANEL IN LAND MOBILE RADIONov 20, 17Mar 15, 18[F21V, H05B, F21Y, G06T, G09G, G06F, H01H]
2016/0198,540 CONTROL HEAD WITH ELECTROLUMINESCENT PANEL IN LAND MOBILE RADIOJan 06, 16Jul 07, 16[F21V, H05B, H04B]
2016/0087,597 AUTOMATIC VOLUME CONTROL FOR LAND MOBILE RADIOJul 31, 15Mar 24, 16[H03G]

Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9923534 Automatic volume control for land mobile radioJul 31, 15Mar 20, 18[H03G]
9852692 Control head with electroluminescent panel in land mobile radioJan 06, 16Dec 26, 17[F21V, G08B, H05B, F21Y, G09G, G06T, H04B, G06F, H01H]
9824635 Control head with electroluminescent panel in land mobile radioJan 06, 16Nov 21, 17[F21V, H05B, F21Y, G09G, G06T, H04B, G06F, H01H]
9814014 System and method for providing mobility management and out-of-coverage indication in a conventional land mobile radio systemJul 07, 14Nov 07, 17[H04W]
9800460 Interoperability gateway for land mobile radio systemJul 31, 15Oct 24, 17[H04L, H04W]
9774386 Distributed simulcast architectureMar 17, 14Sep 26, 17[H04M, H04B]
9763260 System and method for dynamic channel allocatonNov 06, 15Sep 12, 17[H04W]
9729228 Distributed simulcast architectureMar 17, 14Aug 08, 17[H04M, H04B]
9730236 System and method for dynamic channel allocatonNov 06, 15Aug 08, 17[H04W]
9641988 Land mobile radio dispatch consoleJan 14, 13May 02, 17[H04M, H04L, H04B, H04W]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5237233 Optoelectronic active circuit elementExpiredSep 04, 90Aug 17, 93[G21H]
5235232 Adjustable-output electrical energy source using light-emitting polymerExpiredSep 04, 90Aug 10, 93[H02J, H01L, G05F]
5212714 High speed data interface for land mobile communication systemExpiredMay 18, 89May 18, 93[H04L]
5040237 Method and apparatus for an alternate home channel for a land mobile transmission trunked communication systemExpiredDec 08, 89Aug 13, 91[H04Q]
5008579 Light emitting polymer electrical energy sourceExpiredMar 03, 89Apr 16, 91[G21H]
4889961 Graphite trace electrical interconnectExpiredAug 10, 88Dec 26, 89[H05K]
4876700 Data demodulatorExpiredApr 16, 86Oct 24, 89[H04L]
4786903 Remotely interrogated transponderExpiredJun 01, 87Nov 22, 88[H04Q, H03B]
4761823 Communications adaptor bracketExpiredSep 05, 86Aug 02, 88[H04B]
4733169 Digital frequency detectorExpiredApr 15, 86Mar 22, 88[G01R]
4645288 Printed circuit board coaxial connector interfaceExpiredDec 04, 84Feb 24, 87[H01R]
4629227 Latching mechanismExpiredNov 16, 84Dec 16, 86[E05C]
4626806 RF isolation switchExpiredOct 10, 85Dec 02, 86[H01P]
4596440 Electrical probe contactExpiredMar 06, 84Jun 24, 86[H01R]
4550361 Adjustable multiturn air dielectric capacitorExpiredJun 11, 84Oct 29, 85[H01G]
4544577 Process for metallization of dielectric substrate through holesExpiredApr 26, 84Oct 01, 85[B05D]
4534604 Vertical mounting device for electrical circuit board componentsExpiredMar 09, 84Aug 13, 85[H01R]

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