Johannes J. Roering

Follow

Person

Baarn, NL

People

Patents Grantslast 30 patents

Information Patent Grant
Arrangement for obtaining prerecorded digital music cassettes
- Patent number 5,371,634
- Issue date Dec 6, 1994
- U.S. Philips Corporation
- Jozef M. Duurland
- G11 - INFORMATION STORAGE
Information Patent Grant
Prerecorded record carrier
- Patent number 5,363,250
- Issue date Nov 8, 1994
- U.S. Philips Corporation
- Gerardus C. P. Lokhoff
- G11 - INFORMATION STORAGE
Information Patent Grant
Arrangement for obtaining prerecorded digital music cassettes
- Patent number 5,243,470
- Issue date Sep 7, 1993
- Polygram International Holding
- Jozef M. Duurland
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of and arrangement for obtaining prerecorded digital music c...
- Patent number 5,148,330
- Issue date Sep 15, 1992
- Polygram International Holding B.V.
- Jozef M. Duurland
- G11 - INFORMATION STORAGE
Information Patent Grant
Copying apparatus for copying a magnetic pattern from a master magn...
- Patent number 4,882,637
- Issue date Nov 21, 1989
- Polygram International Holding B.V.
- Jozef M. Duurland
- G11 - INFORMATION STORAGE