| Patents for G11B 23 - Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus (25,121) |
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| 03/24/1981 | US4257616 Phonograph record cleaning device |
| 03/24/1981 | US4257524 Cassette storage rack |
| 03/24/1981 | US4257262 Testing apparatus for cassette type tape recorders |
| 03/24/1981 | CA1098198A1 Production control apparatus |
| 03/17/1981 | US4257079 Apparatus for rewinding magnetic tape in video cassette |
| 03/17/1981 | US4257077 Pressure pad and shielding plate for a tape cassette |
| 03/17/1981 | US4257075 Tape magazine and recording and/or playback machine with improved magazine locating and loading structure |
| 03/17/1981 | CA1097803A1 Magneto-resistive reading head with suppression of thermal noise |
| 03/11/1981 | EP0024858A2 Video record disc and playback apparatus and method for it |
| 03/11/1981 | EP0024390A1 Noise reduction apparatus |
| 03/10/1981 | US4254923 Magnetic tape cassette |
| 03/10/1981 | US4254922 Tape cassette |
| 03/10/1981 | US4254917 Reel for tape cassette |
| 03/10/1981 | US4254864 Protective jacket for plane magnetic recording medium |
| 03/10/1981 | US4254585 Process and apparatus for the surface treatment of flexible magnetic recording media |
| 03/03/1981 | US4253568 Video cassette container |
| 03/03/1981 | US4253567 Cassette container |
| 03/03/1981 | CA1096734A1 Storage and demonstration device for polygonal or round flat objects, particularly for card-type display objects |
| 02/24/1981 | US4253129 Disc pack handle mechanism |
| 02/24/1981 | CA1096278A1 Wear resistant alpha alumina article |
| 02/19/1981 | WO1981000480A1 Magnetic tape cassette |
| 02/18/1981 | EP0023977A1 Storage device for articles, particularly recording-tape cassettes |
| 02/17/1981 | US4251843 Anionic, cationic or amphoteric type antistatic agents |
| 02/17/1981 | US4251334 Method and apparatus for controlled, low current start-up of one of a series of electrolytic cells |
| 02/17/1981 | US4251177 Inclined article storage frames with a loading and unloading apparatus |
| 02/11/1981 | EP0023767A1 Video player/recorder for recording on a blank disk and method for home recording |
| 02/10/1981 | US4250528 Magnetic disc recording apparatus |
| 02/10/1981 | US4249710 Reloadable cassette |
| 02/10/1981 | CA1095619A1 Defect detection system |
| 02/10/1981 | CA1095483A1 Endless loop tape magazine |
| 02/04/1981 | EP0023304A2 Couple measuring cassette for cassette tape recording devices |
| 02/04/1981 | EP0020491A4 Dual web sound movie cassette with emulsion stripping web. |
| 02/03/1981 | US4249221 Method and apparatus for preventing contamination of a rotating magnetic disc |
| 02/03/1981 | US4248393 Cassette tape storing case |
| 02/03/1981 | US4248345 Protective cap for a magnetic recording tape cassette |
| 02/03/1981 | US4248344 Tape cassette |
| 01/28/1981 | EP0022905A1 Enclosed self-purging disk pack units |
| 01/27/1981 | US4247876 Dictation recording and transcribing system utilizing a multiple media cartridge apparatus |
| 01/27/1981 | US4247119 Record side identification apparatus for video disc player |
| 01/27/1981 | CA1094685A1 Radiation-sensitive record with protected sensitive surface |
| 01/27/1981 | CA1094680A1 Cleaner for a playing head of a cassette player |
| 01/27/1981 | CA1094525A1 Method of manufacturing a cassette housing of a magnetic-tape cassette and cassette housing in accordance with the method |
| 01/21/1981 | EP0022652A1 A disk record container |
| 01/21/1981 | EP0022651A1 Scanning type magnetic tape recorder and cassette |
| 01/20/1981 | US4245741 Anti-theft packaging device |
| 01/20/1981 | US4245740 Container for magnetic tape cassette |
| 01/20/1981 | US4245404 Audio-visual teaching machine |
| 01/20/1981 | CA1094220A1 Magnetic tape casssette |
| 01/20/1981 | CA1094043A1 Lubricants comprising dialkanolamine derivatives |
| 01/20/1981 | CA1094036A1 Tape reel |
| 01/20/1981 | CA1094022A1 Container for tape cassette |
| 01/14/1981 | EP0022313A1 Recording medium, method of making a recording or a stamper and recording apparatus |
| 01/13/1981 | USRE30482 Pulse code modulated digital audio system |
| 01/13/1981 | US4244078 Method and apparatus for cleaning film |
| 01/07/1981 | EP0021138A1 Cartridge for stuffed ribbon |
| 01/07/1981 | EP0020933A1 Control of relative humidity in disk files |
| 01/07/1981 | EP0020491A1 Dual web sound movie cassette with emulsion stripping web. |
| 01/06/1981 | US4243279 Stacking device |
| 01/06/1981 | US4243142 Tape storage and display apparatus |
| 12/30/1980 | US4242709 Strip media drive system |
| 12/30/1980 | US4242708 Tape recording apparatus using capacitive detectors as tape position sensors |
| 12/30/1980 | US4242075 Extrusion dies for extruding honeycomb structural bodies |
| 12/23/1980 | US4241368 Magnetic sheet recorder with a magnetic sheet surface treating means |
| 12/23/1980 | US4240551 Magnetic tape cassette holder |
| 12/23/1980 | CA1092238A1 Magnetic recording tape cartridge |
| 12/23/1980 | CA1092062A1 Storage and display assembly |
| 12/16/1980 | USRE30448 Tape recorder system |
| 12/16/1980 | US4239307 Storage and demonstration device particularly for card-type display objects |
| 12/16/1980 | US4239238 Record extracting mechanism for caddy type video disc player |
| 12/16/1980 | US4239109 Storage box for substantially parallelepipedic tape and film cases |
| 12/11/1980 | WO1980002768A1 Gas circulation and filtration apparatus for magnetic disc recording systems |
| 12/11/1980 | WO1980002757A1 Process for protecting sound recording carrier and the labels and/or packages thereof against counterfeiting |
| 12/10/1980 | EP0020219A1 Container for video disc |
| 12/10/1980 | EP0020059A1 Protective cap for a magnetic recording tape cassette |
| 12/10/1980 | EP0019729A1 Cleaning device for sensitive surfaces of solid bodies |
| 12/09/1980 | US4238843 Disc-shaped optically readable record carrier used as a data storage medium |
| 12/09/1980 | US4238809 Servo track configuration for magnetic disk apparatus |
| 12/09/1980 | US4238777 Drop-out detecting system for video recording magnetic tape |
| 12/09/1980 | US4238179 Arrangement for pressing flexible discs and a pressing process using this arrangement |
| 12/02/1980 | US4237189 Polymodal magnetic recording media process for making and verifying the same and compositions useful therein |
| 12/02/1980 | US4236682 Slot loaded, low profile magnetic tape drive |
| 12/02/1980 | US4236678 Endless ribbon cartridge |
| 11/27/1980 | WO1980002606A1 Arrangement for the printing of visible markings on a sound tape or a film |
| 11/26/1980 | EP0019514A1 Container for holding a minicassette or such |
| 11/25/1980 | US4236050 System for recovering information from a movable information storage medium having a pilot signal with an aligned phase angle in adjacent tracks |
| 11/25/1980 | US4235490 Video cassette storage and ejection device |
| 11/25/1980 | US4235395 Magnetic tape cassette with pivoting cover |
| 11/25/1980 | US4235339 Latch and carrying handle assembly for magnetic recording disc cartridge |
| 11/25/1980 | US4235334 Cassette storage case |
| 11/18/1980 | US4234140 Magnetic tape cassette drive system |
| 11/18/1980 | US4234137 Tape reel for video tape cassette |
| 11/18/1980 | CA1089984A1 System for compensating for incorrect duty factor when reading out information stored in a video disc |
| 11/12/1980 | EP0018584A1 Recording tape with a leader, particularly magnetic tape and tape spool |
| 11/11/1980 | US4232841 Magnetic recording tape cassette |
| 11/11/1980 | US4232840 Tape cassette |
| 11/04/1980 | US4232350 Tape cassette |
| 11/04/1980 | US4231625 Tape storage cabinet |
| 11/04/1980 | US4231532 Tape cassette with improved tape guiding |
| 11/04/1980 | US4231474 Storage case |
| 11/04/1980 | US4231473 Dual purpose insert for tape cartridges and cassettes |