Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 3969697 | Voltage drop warning apparatus with negative-resistance device A series connection comprising a transistor (4) and a light-emitting diode (3) is connected across a D.C. power source (+Vcc), and one end of a negative-resistance device (1) is connected to the base of said transistor (4) and the other end thereof is con... | 07/13/1976 |
| 3969635 | Voltage condition monitor A device for monitoring a variable voltage supply level is disclosed. The monitoring device functions to supply a signal which may be used to shut-down that equipment being supplied and/or drive an indicating device when the voltage level is below a trip ... | 07/13/1976 |
| 3959605 | Circuit for detecting loss of telephone line voltage The present invention deals with a new and useful circuit for monitoring the condition of a telephone line used for ordinary telephony. The circuit detects malfunctions such as severance and shorting which result in the termination of line potential. The ... | 05/25/1976 |
| 3946375 | Redundant DC power supply for analog computers and the like A power supply system for analog computers and the like where reliability and fail-proof performance are paramount. At least two separate power supplies are connected in parallel to a plurality of operational amplifiers contained in separate channels of a... | 03/23/1976 |
| 3944889 | Short-circuit protection circuit A short-circuit protection circuit for use in an arrangement in which a load is connected to a source of electrical power by way of switch, operates to open the switch only when a true short circuit condition exists, the circuit discrminating between a tr... | 03/16/1976 |
| 3939421 | Circuit for indicating the battery voltage and operation of a radio transmitter A single indicator lamp is provided on a personal or portable, battery powered radio transmitter to indicate when the transmitter is operated. The lamp is connected to a circuit which senses the battery voltage (and hence charge), which causes the lamp to... | 02/17/1976 |
| 3934940 | Safety interlock circuit for switching brake antilock systems in a tractor trailer vehicle combination in and out In the tractor vehicle a current measuring resistor is interposed in the line supplying current to a coupling connector terminal to which the antilock system of a trailer equipped with such a system is connected for its power supply. A resistor load is co... | 01/27/1976 |
