Franz Buttner AG
11Patents
0Active
11Granted
27Portfolio score
Filing activity: Mar 31, 1976 → Aug 29, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4153378A | Re-inking and ventilation control for inked ribbon cassette | Performing Operations; Transporting | 17 | Expired |
| US4655623A | Ink ribbon cassette | Performing Operations; Transporting | 15 | Expired |
| US4502801A | Ribbon cassette for word processors, printers and typewriters | Performing Operations; Transporting | 12 | Expired |
| US4071133A | Cassette for dye impregnated ribbon | Performing Operations; Transporting | 11 | Expired |
| US5127750A | Refillable ink ribbon cartridge | Performing Operations; Transporting | 11 | Expired |
| US4426169A | Typewriting ribbon with adhesively correctable print | Emerging Cross-Sectional Technologies | 5 | Expired |
| USD377663S | Container for toner | General | 5 | Expired |
| US4732500A | Drive mechanism including floating pressure ring for ink ribbon cassette | Performing Operations; Transporting | 4 | Expired |
| US4391536A | Word processor print wheel assembly | Performing Operations; Transporting | 2 | Expired |
| US5062725A | Typewriter or printer ribbon and method for its manufacture | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4735518A | Ink ribbon cassette | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.