Assignee
POLYGRAM GMBH
DE17 patents
Top patents by PatentIndex Score
US4535888AAug 20, 1985
Storage cassette for two or more disk-shaped high memory density information carriers
POLYGRAM GMBH173 citations93
US4874085AOct 17, 1989
Storage cassette for high storage density, disc-shaped information carriers
POLYGRAM GMBH113 citations90
US4126726ANov 21, 1978
Disc-shaped information carrier having information in the form of a beam-reflecting structure and a process for producing the same
POLYGRAM GMBH40 citations86
US4409169AOct 11, 1983
Method for manufacturing disk-shaped information carriers
POLYGRAM GMBH28 citations84
US4633458ADec 30, 1986
Disc-shaped, optically-readable information carrier having a protective edge and/or center part
POLYGRAM GMBH44 citations81
US4179532ADec 18, 1979
Process for producing a disc-shaped information carrier which has information in the form of a beam-reflecting structure
POLYGRAM GMBH21 citations75
US4658392AApr 14, 1987
Optically readable, high storage density, information carrier
POLYGRAM GMBH13 citations72
US4501014AFeb 19, 1985
Method for eliminating unwanted acoustic signals in audio programs to be edited for reproduction
POLYGRAM GMBH14 citations72
US4453158AJun 5, 1984
Method for encoding analog signals
POLYGRAM GMBH11 citations72
US4438522AMar 20, 1984
Method for encoding analog signals using PCM difference code word for forming a code word of specified length
POLYGRAM GMBH12 citations72
US4342635AAug 3, 1982
Anode case for a galvanic bath
POLYGRAM GMBH12 citations63
US4445149AApr 24, 1984
Method for the joining, or mixing-in or fade-in of two audio digital signal segments, free of interfering signals
POLYGRAM GMBH4 citations61
US4665513AMay 12, 1987
Arrangement for error detection for disc-shaped information carriers
POLYGRAM GMBH15 citations59
US4367952AJan 11, 1983
Centering device for the manufacture of a center hole in disks
POLYGRAM GMBH5 citations58
US4613751ASep 23, 1986
Conveyor system for disc magazine having an identifier disc
POLYGRAM GMBH3 citations52
US4361898ANov 30, 1982
Digital synchronizing system
POLYGRAM GMBH6 citations46
US4272990AJun 16, 1981
Device for the measurement of acoustic reverberation time and method
POLYGRAM GMBH5 citations46