Polygram GmbH
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Oct 17, 1989 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 324 Total Citation Count
- Jul 25, 1979 Earliest Filing
- 15 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
- No Technology to Display
Top Patents (by citation)
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Recent Publications
- No Recent Publications to Display
Recent Patents
- No Recent Patents to Display
Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
4874085 Storage cassette for high storage density, disc-shaped information carriersExpiredOct 18, 88Oct 17, 89[B65D]
4665513 Arrangement for error detection for disc-shaped information carriersExpiredOct 09, 84May 12, 87[G06F, G11B]
4658392 Optically readable, high storage density, information carrierExpiredApr 26, 85Apr 14, 87[C23C, G11B, B32B]
4633458 Disc-shaped, optically-readable information carrier having a protective edge and/or center partExpiredMar 30, 84Dec 30, 86[G11B, G01D]
4613751 Conveyor system for disc magazine having an identifier discExpiredMay 30, 84Sep 23, 86[G06M]
4535888 Storage cassette for two or more disk-shaped high memory density information carriersExpiredJan 16, 84Aug 20, 85[B65D]
4501014 Method for eliminating unwanted acoustic signals in audio programs to be edited for reproductionExpiredJan 12, 84Feb 19, 85[G11B]
4445149 Method for the joining, or mixing-in or fade-in of two audio digital signal segments, free of interfering signalsExpiredMar 06, 80Apr 24, 84[G11B]
4438522 Method for encoding analog signals using PCM difference code word for forming a code word of specified lengthExpiredSep 22, 80Mar 20, 84[H03K]
4367952 Centering device for the manufacture of a center hole in disksExpiredMar 30, 81Jan 11, 83[G01B]
4272990 Device for the measurement of acoustic reverberation time and methodExpiredJul 25, 79Jun 16, 81[G01H]
Top Inventors for This Owner
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