O&K COMPANY
7Patents
1Active
7Granted
27Portfolio score
Filing activity: Jul 17, 1975 → Feb 8, 2021
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4397451A | Furnace for the heat treatment of scale-covered steel | Chemistry; Metallurgy | 24 | Expired |
| US4327834A | Document retrieval system | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4330063A | Machine-retrievable card and card retrieval apparatus and method therefor | Physics | 1 | Expired |
| US12319885B2 | Lubricant composition for forming hemimorphite-containing lubrication coating, method for forming said lubrication coating on surface of metal workpiece, and metal workpiece comprising said lubrication coating | Chemistry; Metallurgy | 0 | Active |
| USRE32170E | Machine-retrievable card andcard retrieval apparatus and method therefor | General | 0 | Expired |
| US3963176A | Combined article selector and coder | Physics | 0 | Expired |
| US4011986A | Interposer mechanism | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.