Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6477003 | System for recording and/or reproducing information medium for use in the system, and magnetic write head and arrangement for formatting the medium | Johannes J. W. Kalfs | 2002-11-05 |
| 6239932 | Method of and arrangement for formatting a magnetizable medium | — | 2001-05-29 |
| 6097571 | Magnetic head and system for controlling the position of a magnetic head | Eeltje A. Draaisma | 2000-08-01 |
| 6061196 | System for recording and/or reproducing information medium for use in the system, and magnetic write head and arrangement for formatting the medium | Johannes J. W. Kalfs | 2000-05-09 |
| 5966276 | Magnetic head and system for controlling the position of a magnetic head | Eeltje A. Draaisma | 1999-10-12 |
| 5949607 | System, apparatus and method for recording and reproducing information | Johannes J. W. Kalfs | 1999-09-07 |
| 5912778 | System for recording and/or reproducing information medium for use in the system and magnetic head for formatting the medium | Johanes J.W. Kalfs | 1999-06-15 |
| 5912637 | Magnetic recording method and apparatus which provide at least two write pulses for each binary signal bit to be recorded | Willem Arie ROOS, Johannes J. W. Kalfs | 1999-06-15 |
| 5831798 | Magnetic head configured to read and/or write information on digital and analog form | Johannes C. A. Muller | 1998-11-03 |
| 5805372 | Positioning of a head relative to a plurality of tracks | Johannes J. W. Kalfs | 1998-09-08 |
| 5559642 | Reproducing device used with a record carrier containing two sides recorded in opposite directions that determines the selection of particular read back characteristics | Gerardus C. P. Lokhoff | 1996-09-24 |
| 5488663 | Encoding methods for generating a digital signal containing modulated bit allocation information, and record carriers containing that signal | Jan Dewolf, Gerardus C. P. Lokhoff | 1996-01-30 |
| 5455717 | Recording device with temperature-dependent write-current control | Rudolf A. Van Doorn, Stephanus Josephus Maria Van Beckhoven, Gerardus W. A. Akkermans, Franciscus J. R. Verhallen | 1995-10-03 |
| 5375171 | Transmission system, and transmitter and receiver used in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information | Jan Dewolf, Gerardus C. P. Lokhoff | 1994-12-20 |
| 5325239 | Apparatus for producing recorded tape-like magnetic record carriers, record carrier obtained thereby, and device for reproducing the record carriering device for reproducing the record carrier | Gerardus C. P. Lokhoff | 1994-06-28 |
| 5161210 | Coder for incorporating an auxiliary information signal in a digital audio signal, decoder for recovering such signals from the combined signal, and record carrier having such combined signal recorded thereon | Willem F. Druyvesteyn, Leon Maria Van De Kerkhof, Raymond N. J. Veldhuis | 1992-11-03 |
| 5083224 | Apparatus for recording an audio signal with protection against re-recording thereof, and recording apparatus which indicates the presence of such protection | Gerardus C. P. Lokhoff | 1992-01-21 |
| 4636874 | System for reproducing information signals on a magnetic tape which incrementally adjusts, in a plurality of steps the speed of the magnetic tape and the positioning and rotational speed of the magnetic head upon a change of mode | Franz Kuchar | 1987-01-13 |
| 4439799 | Apparatus for reproducing information recorded in a plurality of adjacent tracks | Peter Haubrich, Uwe Jahnke | 1984-03-27 |
| 4286318 | Control loop | Kornelis A. Immink | 1981-08-25 |