Shinwa Corp.
27Patents
4Active
27Granted
33Portfolio score
Filing activity: Mar 31, 1980 → Jul 2, 2014 · 3 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5581983A | Gas injection device for gas bag having serial closed cells | Performing Operations; Transporting | 77 | Expired |
| US5561657A | Magazine for read/write disks and method and device for reading and writing of said read/write disks | Physics | 38 | Expired |
| US5682364A | Magazine for read/write disks and method and device for reading and writing said disks | Physics | 34 | Expired |
| USD740026S1 | Storage case | General | 33 | Active |
| USD740563S1 | Storage case | General | 24 | Active |
| USD740027S1 | Storage case | General | 22 | Active |
| US4454036A | Oil filter | Performing Operations; Transporting | 17 | Expired |
| US5732535A | Method for packaging article utilizing atmospheric pressure and packaging device | Performing Operations; Transporting | 11 | Expired |
| US4843499A | Tape winding direction switch device of cassette tape recorder | Physics | 7 | Expired |
| US6226253A | Disk driving apparatus | Physics | 6 | Expired |
| US5761185A | Apparatus for reading and writing read/write disks | Physics | 4 | Expired |
| US5291362A | A retractable bi-directional tape head mechanism | Physics | 3 | Expired |
| US5308016A | Tape transport with differential torque between takeup and feed reels | Physics | 3 | Expired |
| US7266828B2 | Disk drive device | Physics | 3 | Expired |
| US9095212B2 | Storage case | Human Necessities | 3 | Active |
| US6941564B2 | Disk insertion, biasing and alignment apparatus | Physics | 2 | Expired |
| US4788607A | Tape winding end detecting device of tape recorder | Physics | 2 | Expired |
| US4283027A | Tape feeder in a tape recorder | Physics | 2 | Expired |
| US4811145A | Head device of tape player | Physics | 2 | Expired |
| US5617640A | Level position measuring method, level marking method and level marking apparatus comprising a tube, capable of directly measuring a height | Physics | 2 | Expired |
| US4334655A | Automatic tape feeding direction reversing device in a tape recorder | Physics | 1 | Expired |
| USD292067S | Carton | General | 1 | Expired |
| US7360226B2 | Disk player | Physics | 1 | Expired |
| US5528439A | Tape player head with a wear-preventing cam arrangement | Physics | 1 | Expired |
| US7414422B2 | System in-package test inspection apparatus and test inspection method | Electricity | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.