Tesla Patents
Tesla Universe : Patents
Welcome to the Nikola Tesla Patent Database
Each patent image can be viewed in detail with the built-in magnification function.
In the near future you'll be able to comment, rate and tag the patents. We will also be adding the U.S. patent wrappers (correspondence between Tesla and the examiners) and the non-U.S. Tesla patents.
Please note that one of our main goals was to preserve the essence of the original patents as closely as possible. A very small number of glaring mistakes, misspellings, etc. were corrected, but otherwise, the patents remain a very close facsimile to the originals. Don't be surprised by finding errors, inconsistencies or mistakes.
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335,786 - Electric-Arc LampCategory: Lighting Country: United States Application Date: March 30th, 1885 Issue Date: February 9th, 1886 
My invention relates more particularly to those arc-lamps in which the separation and feed of the carbon electrodes or their equivalents is accomplished by means of electromagnets or solenoids in connection with suitable clutch-mechanism; and it is designed to remedy certain faults common to the greater part of the... more >>
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334,823 - Commutator for Dynamo-Electric MachinesCategory: Motors & Generators Country: United States Application Date: May 6th, 1885 Issue Date: January 26th, 1886
It is known that in machines of great electro-motive force—such, for instance, as those used for arc lights—whenever one commutator bar or plate comes out of contact with the collecting-brush a spark appears on the commutator. This spark may be due to the break of the complete circuit, or of a shunt of low... more >>
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336,961 - Regulator for Dynamo-Electric MachinesCategory: Motors & Generators Country: United States Application Date: May 18th, 1885 Issue Date: March 2nd, 1886
The object of my invention is to provide an improved method for regulating the current on dynamo-electric machines. In my improvement I make use of two main brushes, to which the ends of the helices of the field-magnets are connected, and an auxiliary-brush and a branch or shunt-connection to form an intermediate... more >>
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336,962 - Regulator for Dynamo-Electric MachinesCategory: Motors & Generators Country: United States Application Date: June 1st, 1885 Issue Date: March 2nd, 1886
In my improvement I employ one or more auxiliary brushes, by means of which I shunt a portion or the whole of the field-helices. According to the relative position upon the commutator of the respective brushes more or less current is caused to pass through the helices of the field, and the current developed by the... more >>
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350,954 - Regulator for Dynamo-Electric MachinesCategory: Motors & Generators Country: United States Application Date: January 14th, 1886 Issue Date: October 19th, 1886
In another applications I have shown the commutator of a dynamo-machine with the main brushes connected in an electric circuit, and one or more auxiliary brushes serving to shunt a part or the whole of the field-coils, the regulation of the current being effected by shifting the respective brushes automatically upon... more >>
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396,121 - Thermo-Magnetic MotorCategory: Motors & Generators Country: United States Application Date: March 30th, 1886 Issue Date: January 15th, 1889
In my present invention I obtain mechanical power by a reciprocating action resulting from the joint operations of heat, magnetism, and a spring or weight or other force—that is to say, I subject a body magnetized by induction or otherwise to the action of heat until the magnetism is sufficiently neutralized to... more >>
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335,787 - Electric-Arc LampCategory: Lighting Country: United States Application Date: July 13th, 1886 Issue Date: February 9th, 1886
In my present invention I further provide means for automatically withdrawing a lamp from the circuit, or cutting out the same, when, from a failure of the feed, the arc reaches an abnormal length, and also means for automatically reinserting such lamp in the circuit when the rod drops and the carbons come into... more >>
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359,748 - Dynamo-Electric MachineCategory: Motors & Generators Country: United States Application Date: December 1st, 1886 Issue Date: March 22nd, 1887
The main objects of my invention are to increase the efficiency of the machine and to facilitate and cheapen the construction of the same; and to this end my invention relates to the magnetic frame and the armature, and to other features of construction, hereinafter more fully explained. My invention is illustrated in... more >>
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382,845 - Commutator for Dynamo-Electric MachinesCategory: Motors & Generators Country: United States Application Date: April 30th, 1887 Issue Date: May 15th, 1888
The objects of the invention are, first, to avoid the sparking and the gradual wearing away or destruction of the commutator-segments and brushes or collectors resulting therefrom; second, to obviate the necessity of readjustment of the commutator or the brushes or collectors and other consequences of the wear of the... more >>
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428,057 - Pyromagneto-Electric GeneratorCategory: Motors & Generators Country: United States Application Date: May 26th, 1887 Issue Date: May 13th, 1890
This invention is an improved form of electrical generator based upon the following well-known laws: First, that electricity or electrical energy is developed in any conducting-body by subjecting such body to a varying magnetic influence, and, second, that the magnetic properties of iron or other magnetic substance... more >>
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