Assignee
POLYGRAM GMBH
DE·17 granted patents·519 citations·filing 1977–1988
Top patents by PatentIndex Score
17 records- 0193US4535888AStorage cassette for two or more disk-shaped high memory density information carriersPOLYGRAM GMBH·Filed 1984·Granted Aug 20, 1985·173 cites·8 claims
- 0292US4874085AStorage cassette for high storage density, disc-shaped information carriersPOLYGRAM GMBH·Filed 1988·Granted Oct 17, 1989·113 cites·9 claims
- 0382US4633458ADisc-shaped, optically-readable information carrier having a protective edge and/or center partPOLYGRAM GMBH·Filed 1984·Granted Dec 30, 1986·44 cites·6 claims
- 0481US4126726ADisc-shaped information carrier having information in the form of a beam-reflecting structure and a process for producing the samePOLYGRAM GMBH·Filed 1977·Granted Nov 21, 1978·40 cites·12 claims
- 0576US4179532AProcess for producing a disc-shaped information carrier which has information in the form of a beam-reflecting structurePOLYGRAM GMBH·Filed 1978·Granted Dec 18, 1979·21 cites·8 claims
- 0667US4409169AMethod for manufacturing disk-shaped information carriersPOLYGRAM GMBH·Filed 1981·Granted Oct 11, 1983·28 cites·12 claims
- 0765US4501014AMethod for eliminating unwanted acoustic signals in audio programs to be edited for reproductionPOLYGRAM GMBH·Filed 1984·Granted Feb 19, 1985·14 cites·5 claims
- 0862US4658392AOptically readable, high storage density, information carrierPOLYGRAM GMBH·Filed 1985·Granted Apr 14, 1987·13 cites·7 claims
- 0957US4665513AArrangement for error detection for disc-shaped information carriersPOLYGRAM GMBH·Filed 1984·Granted May 12, 1987·15 cites·10 claims
- 1056US4342635AAnode case for a galvanic bathPOLYGRAM GMBH·Filed 1981·Granted Aug 3, 1982·12 cites·5 claims
- 1149US4453158AMethod for encoding analog signalsPOLYGRAM GMBH·Filed 1982·Granted Jun 5, 1984·11 cites·5 claims
- 1245US4438522AMethod for encoding analog signals using PCM difference code word for forming a code word of specified lengthPOLYGRAM GMBH·Filed 1980·Granted Mar 20, 1984·12 cites·10 claims
- 1338US4445149AMethod for the joining, or mixing-in or fade-in of two audio digital signal segments, free of interfering signalsPOLYGRAM GMBH·Filed 1980·Granted Apr 24, 1984·4 cites·5 claims
- 1437US4361898ADigital synchronizing systemPOLYGRAM GMBH·Filed 1981·Granted Nov 30, 1982·6 cites·5 claims
- 1533US4613751AConveyor system for disc magazine having an identifier discPOLYGRAM GMBH·Filed 1984·Granted Sep 23, 1986·3 cites·8 claims
- 1633US4367952ACentering device for the manufacture of a center hole in disksPOLYGRAM GMBH·Filed 1981·Granted Jan 11, 1983·5 cites·10 claims
- 1727US4272990ADevice for the measurement of acoustic reverberation time and methodPOLYGRAM GMBH·Filed 1979·Granted Jun 16, 1981·5 cites·12 claims
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