Patents
Sitemap › G11 - Information storage › G11B - Information storage based on relative movement between record carrier and transducer › G11B 3 - Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
Patents for G11B 3 - Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor (2,921)
11/1981
11/17/1981US4301526 Tonearm control system based on absolute tonearm position
11/17/1981US4301099 Method and device for manufacturing a plastics record carrier
11/17/1981CA1112761A1 Air bearing for information carrier in the form of a flexible disc and disc reader using this air bearing
11/17/1981CA1112408A1 Process for producing information carrying discs
11/10/1981US4300228 Pickup arm control mechanism and electrical circuitry therefore
11/03/1981US4298976 Microphonograph record
10/1981
10/27/1981US4297312 Method for preparing stylus lapping discs
10/20/1981US4296158 Polyacryloyl-containing heterocycle coating for video
10/20/1981US4295277 Stylus positioner
10/13/1981US4295216 Apparatus for measuring the characteristics of a wideband electromechanical recording system having a transformer
10/13/1981CA1110548A1 Circuit for suppressing noise caused by scratches on a gramophone record
10/07/1981EP0037073A2 Centering device to make a centre hole in discs
10/06/1981CA1110180A1 Record player with stylus-pressure adjusting and displaying means
10/06/1981CA1110179A1 Cantilever for pickup cartridge and process for manufacture thereof
09/1981
09/29/1981US4292511 Apparatus and method for reading an identifying label on an information record
09/29/1981US4291886 Automatic record changer
09/29/1981CA1109803A1 Tone arm assembly
09/22/1981CA1109399A1 Cleaning device for phonograph records
09/15/1981US4289316 Apparatus for the cleaning of phonograph records
09/09/1981EP0035192A1 Disc-like record carrier reproducing apparatus keeping the stylus pressure at a constant level
09/08/1981US4287689 Method for improving the quality of low frequency output of a video disc pickup stylus
09/01/1981US4287587 Signal loss dectector for video disc
09/01/1981US4286789 Simplified record player
08/1981
08/25/1981US4286290 Fast recovery squelch circuit for a video disc player
08/25/1981US4285524 Stylus cleaning apparatus for video disc player
08/19/1981EP0033991A2 Record player
08/18/1981US4284279 Phonograph record player
08/11/1981US4283315 Gramophone record composition
08/11/1981CA1106665A1 Audiovisual card reproducing device
08/11/1981CA1106560A1 Method of manufacturing a plastics record carrier having a stratified structure as well as a device for carrying out the method
08/06/1981WO1981002236A1 Process for making discs
08/06/1981WO1981002137A1 Information carrying discs
08/04/1981US4282311 Method for fabricating flyleads for video disc styli
08/04/1981US4281816 Automatic apparatus for molding a preform
08/04/1981CA1106497A1 Wideband electromechanical recording system
07/1981
07/28/1981US4280705 Record player
07/23/1981WO1981001981A1 Manufacture of blanks for recording discs utilizing coextrusion and blanks and records made thereby
07/22/1981EP0032452A2 Manufacture of blanks for recording discs utilizing coextrusion and blanks and records made thereby
07/21/1981US4280024 Selectively damped video disc stylus assembly
07/21/1981US4280023 Stylus position sensing apparatus for video disc player
07/21/1981US4279423 Phonograph decoupling apparatus
07/21/1981CA1105441A1 Cleaning and lubricating compositions
07/15/1981EP0032005A1 Improvements in or relating to disc record preparation
07/14/1981CA1105173A1 Protective compositions for recording
07/14/1981CA1104940A1 Tone arm assembly
07/08/1981EP0031361A1 Phonograph tone arm system
07/08/1981EP0031360A1 Phonograph tone arm control system
07/07/1981US4277796 Slow down color processor for video disc mastering using a special mode VTR
07/07/1981US4277070 Phonograph
06/1981
06/30/1981US4276635 Pickup cartridge and mounting device therefor
06/30/1981US4275888 Stabilizing and static removing attachment for phonograph pickup cartridge
06/16/1981US4273967 Stylus for reproducing capacitive videodisc
06/16/1981CA1102973A1 Method and means for replicating centrally apertured video disc records
06/09/1981CA1102781A1 Protective compositions for recording
06/02/1981US4270758 Lever operated stylus guard for phonograph pick-up cartridge
06/02/1981CA1102246A1 Phonograph cartridge replaceable stylus assembly
05/1981
05/26/1981US4269739 Solutions or emulsions containing a wax, a silicone oil lubricant, a polysiloxane surfactant, a fluoro-containing surfactant, and a nonionic surfactant; television and audio devices; antistatic agents
05/26/1981US4269416 Head shell for record player tonearms
05/19/1981US4268039 Tangential pick-up device for a gramophone turn-table
05/12/1981US4266785 Stylus lifting/lowering actuator with improved electromagnetic motor
05/12/1981US4266783 Control mechanisms for pick-up arms of record players
05/12/1981CA1100886A1 Phonograph actuated elements
05/05/1981US4265698 Process of forming a sound needle and sound needle construction
05/05/1981CA1100633A1 Reproducing transducer capable of tracking control
05/05/1981CA1100631A1 Magnetic recording medium and method of preparing the same
05/05/1981CA1100413A1 Automatic record player
04/1981
04/30/1981WO1981001216A1 Improved tone arm structure and device for heading record disk by special song selection plate for record player
04/28/1981US4264078 Pickup arm
04/28/1981CA1100051A1 Record player
04/28/1981CA1100050A1 Record player for stationary disc records
04/21/1981US4263634 Magnetic disk-jacket assembly
04/21/1981US4262912 Phonograph tone arm control device
04/21/1981US4262875 Information record stampers
04/21/1981CA1099814A1 Track following servo system and track following code
04/15/1981EP0026880A1 Disc-shaped record carrier and process for its production
04/14/1981US4262174 Track skipper for video disc player
04/14/1981US4261580 Arm pipe for record player tonearms
04/07/1981US4260163 Phonographic source
04/07/1981US4260162 Tonearm control system
04/07/1981CA1099015A1 Malfunction detector for a dictation system
04/01/1981EP0025827A1 Flexible magnetic data storage disk jacket assemblies
03/1981
03/31/1981CA1098267A1 Method and device for manufacturing information carriers
03/24/1981US4258233 Track skipper apparatus for video disc player
03/24/1981US4257616 Phonograph record cleaning device
03/24/1981US4257615 Tone arm
03/18/1981EP0025387A1 Apparatus for moulding information carrying discs
03/17/1981US4256312 Turn table device for record players
03/17/1981US4256311 Video disc stylus retractor
03/17/1981US4256310 Lead-in system for record player
03/17/1981CA1097806A1 Stylus for reproducing information signals recorded on a recording medium
03/17/1981CA1097571A1 Tone arm assembly
03/11/1981EP0024858A2 Video record disc and playback apparatus and method for it
03/11/1981EP0024607A1 Scanning system for a record carrier with spiral-shaped groove
03/10/1981US4254959 Phonograph tone arm control system
03/03/1981US4254184 Vibrating member for acoustic transducer and method for manufacturing the same
03/03/1981CA1096777A1 Phonograph record track selection system
02/1981
02/24/1981US4253126 Linear tracking arm assembly
02/24/1981US4252327 Video disc player
02/24/1981US4252326 Sound reproducing device
02/17/1981US4251080 Tone arm
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