Norbert C. Vollmann
26Patents
6h-index
13Co-inventors
62Inventor score
Filing activity: Feb 27, 1985 → Oct 28, 1998
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5309302A | System comprising a player and/or recorder apparatus and a tape cassette, and the apparatus and a cassette suitable for use in such a system | Physics | 42 | Expired |
| US5231553A | System comprising magnetic tape cassette apparatus and two different types of magnetic tape cassettes playable in such apparatus | Physics | 18 | Expired |
| US4722239A | Gear mechanism | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5219090A | Holder provided with two compartments and a cover arrangement | Physics | 9 | Expired |
| US5074486A | Magnetic-tape cassette | Physics | 7 | Expired |
| US5357390A | Magnetic tape with a cylindrical magnetic head housing | Physics | 6 | Expired |
| US4642706A | Video cassette recorder with improved tape guiding and tensioning | Physics | 6 | Expired |
| US5214554A | Cassette for a record carrier | Physics | 5 | Expired |
| US5184259A | Helical-scan magnetic tape apparatus having a tape-transport path with twisting path-sections for tape-path correction | Physics | 5 | Expired |
| US5365393A | Magnetic tape cassette having a groove extending perpendicular to a front wall thereof for engagement by a loading mechanism of a tape cassette apparatus | Physics | 4 | Expired |
| US5883755A | Apparatus for storage and/or reproduction of information on/from an information carrier | Physics | 3 | Expired |
| US5986854A | Magnetic cassette recorder with reversing and translating magnetic head | Physics | 3 | Expired |
| US5592352A | System for recording/reproducing signals on/from a magnetic tape in a cassette | Physics | 3 | Expired |
| US5237479A | Tape cassette with slidable cover | Physics | 3 | Expired |
| US5264987A | Cassette for magnetic tape provided with window | Physics | 2 | Expired |
| USD442605S | Extended tape cartridge | General | 2 | Expired |
| US6016236A | Apparatus for the storage and/or reproduction of information on/from an information carrier | Physics | 2 | Expired |
| USD331235S | Digital compact cassette | General | 2 | Expired |
| US5404251A | Auto reverse cassette deck capable of recording/reproducing with two different cassette types and formats | Physics | 1 | Expired |
| US5734539A | System for recording and/or reproducing information, including a cassette with a record carrier in tape form and an apparatus | Physics | 1 | Expired |
| US5760996A | System for recording/reproducing signals on/ from a magnetic tape in a cassette | Physics | 1 | Expired |
| US5610778A | Magnetic tape apparatus which senses and plays different types of cassette | Physics | 0 | Expired |
| US6122137A | Loading mechanism for a recording and reproducing apparatus wherein a switch mechanism and the loading mechanism are a single unit | Physics | 0 | Expired |
| US5187629A | Cassette with magnetic tape on two coplanar reels | Physics | 0 | Expired |
| US5779173A | Apparatus for operating the shutter of a cassette | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.