Silver Seiko Ltd.
58Patents
0Active
58Granted
35Portfolio score
Filing activity: Sep 12, 1975 → Oct 31, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4609421A | Automatic envelope sealing device | Performing Operations; Transporting | 29 | Expired |
| US5583552A | Optimum phase determination based on the detected jet current | Performing Operations; Transporting | 23 | Expired |
| US4538931A | Drive mechanism including a one-way spring clutch for a typewriter | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4611937A | Ribbon feed mechanism for a printer | Performing Operations; Transporting | 17 | Expired |
| US4605327A | Print ribbon cassette including ribbon tensioning means | Performing Operations; Transporting | 15 | Expired |
| US4480931A | Electronic typewriter | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5000595A | Printing apparatus | Performing Operations; Transporting | 14 | Expired |
| US4079601A | Control device in a knitting machine | Textiles; Paper | 14 | Expired |
| USD277193S | Ribbon cartridge for typewriter | General | 14 | Expired |
| US4734632A | Driving device for a stepping motor | Electricity | 13 | Expired |
| US4734631A | Step motor control | Electricity | 12 | Expired |
| USD305775S | Copying machine | General | 12 | Expired |
| USD273117S | Typewriter for European languages | General | 11 | Expired |
| US4830525A | Typewriter with pivoting keyboard | Performing Operations; Transporting | 10 | Expired |
| US4946297A | Printing apparatus | Performing Operations; Transporting | 10 | Expired |
| US4682932A | Industrial robot | Performing Operations; Transporting | 10 | Expired |
| US4573813A | Ribbon lift device for a printer | Performing Operations; Transporting | 10 | Expired |
| US4589646A | Automatic paper feeding device for a printer | Performing Operations; Transporting | 10 | Expired |
| USD284771S | Menu printer | General | 9 | Expired |
| USD285567S | Output printer for electronic computer | General | 9 | Expired |
| USD286057S | Ribbon cassette for typewriter | General | 8 | Expired |
| US4085597A | Knitting machine coupled with the program reading device | Textiles; Paper | 7 | Expired |
| USD297714S | Score collector for base-ball game | General | 7 | Expired |
| USD299249S | Typewriter | General | 6 | Expired |
| USD282178S | Typewriter | General | 6 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.