Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5629569 | Thermal photocontrol switch circuit A self-configuring photoelectric control circuit for controlling operation of a load based on ambient light. The photocontrol circuit comprises a photocell responsive to ambient light, a heating resistor connected to the photocell, a bimetallic element in... | 05/13/1997 |
| 5626053 | Floatless gauge with resistive/conductive polymer A floatless liquid level gauge assembly utilizing polymeric resistive/conductive elements is provided which measures the liquid level of partially conductive or conductive liquids in a tank using a three terminal voltage divider network or a two terminal ... | 05/06/1997 |
| 5554965 | Lubricated variable resistance control having resistive pads on conductive path The present invention provides a lubricated variable resistance control including a substrate having formed thereon an electrical resistance path and an electrical conductive path, and a movable contact electrically bridging the electrical resistance path... | 09/10/1996 |
| 5315162 | Electrochemical synapses for artificial neural networks An electrochemical synapse adapted for use in a neural network which includes an input terminal and an output terminal located at a distance of less than 100 microns from the input terminal. A permanent interconnect having controllable conductivity is loc... | 05/24/1994 |
| 5142267 | Level sensor which has high signal gain and can be used for fluids particularly chemically corrosive fluids A PTC-resistor which is a temperature dependent electrical thermistor of semiconductor ferro-electric ceramic which is provided with power leads and serves as a sensor element is directly fused into glass. The power leads are welded to metal coatings form... | 08/25/1992 |
| 5097248 | Electrode for level detection An electrode for level detection includes a detection electrode including conductor portions and resistor portions arranged and formed one after the other in a level change direction. An insulating coating layer is formed on either each conductor portion ... | 03/17/1992 |
| 4980646 | Impedance tomographic tactile sensor Disclosed is a container holding a partially conductive ionic fluid with a flexible tactile surface covering the fluid and sealing the container. Along the bottom of the container a series of parallel conductors are located with the farthest spaced apart ... | 12/25/1990 |
| 4792777 | Variable water resistor for controlling the application of a therapeutic voltage to the human body An output controller for low-frequency treatment device for use in a bath, comprising a low-frequency oscillator; a variable water resistor having fixed terminals connected with the output terminal of the low-frequency oscillator; and an active electrode ... | 12/20/1988 |
| 4734824 | Electrical insulating oil and electrical appliances impregnated with the same An electrical insulating oil which is suitable for use in impregnating electrical appliances such as capacitors, cables and transformers, especially those in which plastic materials are used partially or totally as dielectrics or insulating materials, and... | 03/29/1988 |
| 4510483 | Liquid rheostat for starting an electric motor with improved sill structure A variable level liquid rheostat having a tubular overflow member between a starting chamber and a tank for controlling the level of electrolyte in the starting chamber. The overflow member has a closed upper end inside the starting chamber and lateral di... | 04/09/1985 |
| 4325049 | Electrode for a liquid rheostat, and a liquid rheostat including such an electrode An electrode for a liquid rheostat comprises a plurality of globally annular elements arranged successively and electrically connected together two at a time. The annular elements progressively decrease in size. The electrode can be formed from a continuo... | 04/13/1982 |
| 4107642 | Potentiometer joystick A joystick comprising a control handle within which is located an inclination sensitive potentiometer. The potentiometer includes an elongate resistance element and an electrically conductive liquid wiper. Movement of the potentiometer causes the wiper to... | 08/15/1978 |
