Franz Buttner AG
Records under this name other than patents Franz Buttner AG holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 4,071,133 | Cassette for dye impregnated ribbon Term ended Term ended no later than Jan 31, 1998 · Low confidence | Term ended | Term ended no later than Jan 31, 1998 | Low confidence |
| US 4,153,378 | Re-inking and ventilation control for inked ribbon cassette Term ended Term ended no later than May 8, 1999 · Low confidence | Term ended | Term ended no later than May 8, 1999 | Low confidence |
| US 4,391,536 | Word processor print wheel assembly Term ended Term ended no later than Jul 5, 2003 · Low confidence | Term ended | Term ended no later than Jul 5, 2003 | Low confidence |
| US 4,426,169 | Typewriting ribbon with adhesively correctable print Term ended Term ended no later than Jan 17, 2004 · Low confidence | Term ended | Term ended no later than Jan 17, 2004 | Low confidence |
| US 4,502,801 | Ribbon cassette for word processors, printers and typewriters Term ended Term ended no later than Mar 5, 2005 · Low confidence | Term ended | Term ended no later than Mar 5, 2005 | Low confidence |
| US 4,655,623 | Ink ribbon cassette Term ended Term ended no later than Apr 7, 2007 · Low confidence | Term ended | Term ended no later than Apr 7, 2007 | Low confidence |
| US 4,732,500 | Drive mechanism including floating pressure ring for ink ribbon cassette Term ended Term ended no later than Mar 22, 2008 · Low confidence | Term ended | Term ended no later than Mar 22, 2008 | Low confidence |
| US 4,735,518 | Ink ribbon cassette Term ended Term ended no later than Apr 5, 2008 · Low confidence | Term ended | Term ended no later than Apr 5, 2008 | Low confidence |
| US 5,062,725 | Typewriter or printer ribbon and method for its manufacture Term ended Term ended no later than Nov 5, 2011 · Low confidence | Term ended | Term ended no later than Nov 5, 2011 | Low confidence |
| US 5,127,750 | Refillable ink ribbon cartridge Term ended Term ended no later than Jul 7, 2012 · Low confidence | Term ended | Term ended no later than Jul 7, 2012 | Low confidence |