Bizarre Patents
A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 4186341 | Magnetic developing agent level detection apparatus using an oscillator whose frequency is controlled by the level In detecting the presence or absence of a developing agent or determining the residual amount thereof, at least one coil is arranged outside a developing agent container, so that a change in magnetic permeability caused by the presence or absence of a dev... | 01/29/1980 |
| 4131081 | 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... | 12/26/1978 |
| 4112867 | Apparatus for controlling the toner concentration of a developer used in a dry type developing system An apparatus for controlling the toner concentration of a dry developer, including a magnetic carrier and a non-magnetic toner, used in a magnetic brush developing system. In view of that the system includes an inherent magnetic means and an inherent circ... | 09/12/1978 |
| 4088092 | Toner density sensing apparatus for electrostatic copying machine A coil is provided to a developing tank containing a toner mixture consisting of ferromagnetic carrier particles and non-magnetic toner particles in such a manner as to be magnetically coupled with the mixture. The coil constitutes a frequency determining... | 05/09/1978 |
| 4054230 | Method of detecting a toner concentration The method detects a toner concentration in a developer comprising a mixture of magnetic carrier particles and a non-magnetic toner through the determination of a leakage magnetic flux with a Hall element having a high sensitivity. The mixture is first sh... | 10/18/1977 |
