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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 4452174 | Toner concentration sensor assembly for electro-photographic apparatus A toner concentration sensor assembly wherein a toner cartridge carrying a fresh supply of toner material is demountably insertable into the assembly so as to bring the fresh toner into the original developer mix and wherein a portion of developer mix is ... | 06/05/1984 |
| 4423948 | Dual component developing material detecting device for electrostatic copying apparatus A detecting device for detecting when the amount of toner in a dual component developing material is less than a predetermined level includes a hopper for supplying the toner, a stirring roller for stirring a carrier and the toner from the hopper, and a d... | 01/03/1984 |
| 4321886 | Apparatus for controlling toner concentration An apparatus for controlling toner concentration utilizing a hollow body upon which a detecting coil is wound. The hollow body responses to the inductance of the developer passing through. The apparatus further comprises: a first digital oscillator with t... | 03/30/1982 |
| 4292925 | Toner concentration detecting apparatus A toner concentration detecting apparatus is disclosed wherein developing powder including magnetic carrier and pigmented toner is carried on a magnet roller and transported thereby to a surface of a photosensitive drum, and after development a portion of... | 10/06/1981 |
| 4257348 | Device measuring the concentration of toner in a developer mixture Disclosed is a device for measuring the concentration of toner in a developer mixture composed of toner and a ferromagnetic carrier material, e.g., in an electro-photographic developing device. The device comprises a measuring oscillator which comprises a... | 03/24/1981 |
| 4240375 | Apparatus for detecting concentration of toner in developing powder An apparatus for detecting the concentration of toner particles contained in the developing powder is disclosed wherein the developing powder comprising a mixture of magnetic carrier particles and the toner particles is transported while being adsorbed by... | 12/23/1980 |
| 4208985 | Apparatus for monitoring the concentration of toner in a developer mix Apparatus for monitoring the concentration of toner in a mass of developer mix including the toner and carrier particles, having a sampling cylinder inside which the developer mix flows. An accumulating cylinder is disposed over the sampling cylinder. At ... | 06/24/1980 |
| 4064834 | Apparatus for sensing the concentration of toner in a developer mix An apparatus and method for sensing and controlling the concentration of toner in a developer mix comprising toner and carrier particles used to develop electrostatic images on a photoconductive or the like member includes the provision of a surface which... | 12/27/1977 |
| 3999687 | Toner concentration detector A toner concentration detecting and toner replenishing system for use in an electrostatic copier having a magnetic brush which carries dry developer comprising a mixture of ferromagnetic carrier particles and toner particles into contact with the surface ... | 12/28/1976 |
| 3970036 | Toner concentration detector for dry powder magnetic brush toning system A toner concentration detecting and toner replenishing system for use in an electrostatic copier having a magnetic brush which carries dry developer comprising a mixture of ferromagnetic carrier particles and toner particles into contact with the surface ... | 07/20/1976 |
