|
| US4073310 | 2 Sep 1975 | 14 Feb 1978 | Industrial Filter & Pump Mfg. Co. | Method and apparatus for controlling the liquid level above a solid bed |
| US4188634 | 19 May 1978 | 12 Feb 1980 | Koh-I-Noor Rapidograph, Inc. | Method for regulating ink flow in drafting pens |
| US4337468 | 7 Nov 1980 | 29 Jun 1982 | Ricoh Co., Ltd. | Method and device for controlling concentration of ink for ink-jet printer |
| US4342042 | 19 Dec 1980 | 27 Jul 1982 | Pitney Bowes Inc. | Ink supply system for an array of ink jet heads |
| US4392147 | 30 Jun 1981 | 5 Jul 1983 | J. S. Staedtler KG | Apparatus for supplying and regulating a writing medium to the writing unit of a writing or drawing machine |
| US4555709 | 12 Apr 1984 | 26 Nov 1985 | The Mead Corporation | Ink reconstitution system and method for ink drop printer |
| US4580143 | 25 Jun 1984 | 1 Apr 1986 | Ricoh Systems, Inc.
Ricoh Co. Ltd. | Viscosity control of ink-jet inks |
| US4599624 | 17 Jan 1984 | 8 Jul 1986 | Sharp Kabushiki Kaisha | Atmospheric pressure chamber in an ink jet system printer |
| US4626874 | 3 Jul 1985 | 2 Dec 1986 | Ricoh Company, Ltd. | Liquid level detector for ink jet printer |
| US4628329 | 23 May 1985 | 9 Dec 1986 | Image S.A. | Circuit for feeding ink to an ink-jet printing head |
| US4802334 | 5 Oct 1987 | 7 Feb 1989 | United Technologies Corporation | Augmentor fuel system |
| US4825228 | 9 Mar 1987 | 25 Apr 1989 | | Method of, and apparatus for, regulating ink viscosity in an ink jet printing system |
| US5427136 | 27 Nov 1991 | 27 Jun 1995 | The Langston Corporation | Fluid level detection system |
| US5444472 | 7 Sep 1993 | 22 Aug 1995 | Matthews International Corporation | Method of and an apparatus for using an ink concentrate in an ink jet printing arrangement |
| US5526026 | 17 Mar 1994 | 11 Jun 1996 | Scitex Digital Printing, Inc. | Concentration control for a continuous ink jet printer utilizing resistivity |
| US7163283 | 21 Oct 2004 | 16 Jan 2007 | Eastman Kodak Company | Reuse of solvent startup/shutdown fluid for concentration control |
