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| Title | Primary Class | Description | Inventor | Assignee | Issue Date | Patent No. |
| Improvement in revolving lights for lighthouses | 116/202 | To enable mariners to distinguish the light of one light-house from another and to save the need to add more lights for this purpose by using revolving lights created by using vertical revolving shades moving on a rail in front of the light causing it to appear and disappear in sudden flashes. | Benjamin F. Willard | Benjamin F. Willard | February 20, 1839 | US1085 |
| Improvement in electromagnetic telegraph | 340/825.36 | The five-needle telegraph | Charles Wheatstone; William Fothergill Cooke | Charles Wheatstone; William Fothergill Cooke | June 10, 1840 | US1622 |
| Improvement in the mode of communicating information by signals by the application of electro-magnetism | 178/2R | Samuel Morse’s electrical telegraph that was capable of transmitting over long distances using poor quality wire. His assistant, Alfred Vail developed the Morse code signaling alphabet with Morse. America's first telegram was sent by Morse on 6 January 1838, across two miles (3 km) of wire at Speedwell Ironworks near Morristown, New Jersey. The message read "A patient waiter is no loser." | Samuel F. B. Morse | Samuel F. B. Morse | June 20, 1840 | US1647 |
| Improvement in telegraphy | 116/282 | A mechanical signaling system using a stretched wire between two points of communication | Samuel Frew | Samuel Frew | July 2, 1842 | US2701 |
| Method of introducing wire into metallic pipe | 254/134.3R | Introducing wires in hollow pipes through a hollow mandrel on which the metallic pipe is made | Samuel F. B. Morse | Samuel F. B. Morse | October 25, 1843 | US3316 |
| Metallic Feflector | 362/350 | Improvement in signaling metallic reflectors of lighthouses and railroads for the purpose of protecting their polished surfaces | Alonzo Farrar | Alonzo Farrar | April 4, 1844 | US3518 |
| Light-House Lamp | 431/309 | A moveable cap or ferrule applied to, or slipped upon the inner air tube of the burner for the flame to act upon, instead of against the top of the inner tube as heretofore arranged. | Winslow Lewis | Winslow Lewis | August 7, 1844 | US3692 |
| Improvement in signal-telegraphs | 116/281 | Flag semaphore: the combination of numeral and decimal or denominator flags; signaling the alphabet so as only to use one sign for each letter of the alphabet by means of decimal progression. | Henry I. Rogers | Henry I. Rogers | September 27, 1844 | US3765 |
| Improvement in Electro-magnetic telegraphs | 178/95 | The use of a local battery and magnet in combination with a battery and magnet connected with the main line or lines to enable the telegraph operation over longer lines. | Samuel F. B. Morse | Samuel F. B. Morse | April 11, 1846 | US4453 |
| Improvement in magnetic printing-telegraphs | 178/35 | Recording and printing the Morse code in alphabetic written form | Royal E. House | Royal E. House | April 18, 1846 | US4464 |
| Improvement in telegraph-manipulators | 178/17A | Improvement of telegraph key or manipulator | Edward R. Roe | Edward R. Roe | May 30, 1848 | US5612 |
| Improvement in insulating support for telegraph-wires | 174/154 | A roof serves to keep the insulator from contact with moisture, and also prevents it from being removed from its position | R. R. Livingstone; J. J. Roggen; Calvin Adams | R. R. Livingstone; J. J. Roggen; Calvin Adams | October 31, 1848 | US5889 |
| Bell-Telegraph | 116/2 | Bell communication by a few users in a building or ship by triggering different bell chimes for signals by pulling wires that activate a different bell signal. | Jacob G. Day | Jacob G. Day | December 19, 1848 | US5969 |
| Improvement in indicating-telegraph | 340/815.58 | Means of conveying intelligence at a distance by means of a revolving toothed dial marked with the successive series of the numerals 0, 1, 2, 3, 4 by which combination are indicated alphabetical letters. By hand turning the dial, the code is translated into electricity pulses. | L. G. Curtiss | L. G. Curtiss | January 16, 1849 | US6040 |
| Improvement in electromechanical-telegraphs | 178/62 | Facsimile (fax): A style or point holder so as to afford the regulation of the style pressure on the surface of the chemically prepared paper or fabric and regulating the motion of the paper revolving wheel or roller and insure it being drawn continually forward. | Robert Smith; Alexander Bain | Robert Smith; Alexander Bain | October 30, 1849 | US6837 |
| Signal-Lantern | 362/168 | Subdividing the front of the lantern into three sections with different color glasses (green, red, white) that enable the creation of all needed signals for marine practice. | Hugh Sangster | Hugh Sangster | December 18, 1849 | US6959 |
| Improvements in telegraphs | 178/35 | Improvement of telegraph electromagnet (relay) speed by adding a spring to the armature | David E. Hughes | David E. Hughes | May 20, 1856 | US14917 |
| Improvements in electric telegraphs | 370/276 | Time division telegraph: Transmitting different electric signals, alternately and successively, resulting from the actions of two or more operators working at the same time at the same or opposite ends of a single main conductor or wire of communication. | Harrison Gray Dyar | Harrison Gray Dyar | June 30, 1857 | US17673 |
| Improvements in methods of laying submarine-telegraph cables | 405/158 | Improvements in methods of laying submarine-telegraph cables | Owen G. Warren | Owen G. Warren | September 28, 1858 | US21634 |
| Improvements in electro-magnetic telegraphs | 370/276 | Duplex telegraph, by dlaying signals of one operator. | David E. Hughes | David E. Hughes | January 4, 1859 | US22531 |
| Improved method of enabling moving railway-trains to telegraph their own passings at certain stations | 246/69 | Railway alarm | Ernst Otto Phol | Ernst Otto Phol | January 11, 1859 | US22610 |
| Improvements in telegraphic machines | 178/35 | Printing telegraph | Geo. M. Phelps | Geo. M. Phelps | November 1, 1859 | US26003 |
| Improvements in telegraphs | 178/99.1 | Electro acoustic telegraph: Applying an acoustic tube to the operator’s ear to prevent the hearing of the messages’ sounds and clicks by unauthorized parties. | Alexander Bain | Alexander Bain | July 23, 1861 | US32854 |
| Improvements in telegraph poles | 174/32 | Insulators are grounded by a wire running on the pole to the ground to prevent leakage and telegraphic disturbances | C. F. Varley | C. F. Varley | March 10, 1868 | US75492 |
| Improvements in reflecting galvanometers | 324/97 | A sensitive galvanometer to measure tiny currents especially for testing long telegraph submarine lines and analogous telegraph circuits | William Thomson (Lord Kelvin) | William Thomson (Lord Kelvin) | July 6, 1869 | US92228 |
| Improvement in electric telegraph apparatus | 178/91 | Prevention of the accumulation of ink at the point of the marking tube when signals are not being received; preventing vibration from the paper drawing gear and marking tube; the same paper is applied for recording the transmitted and received message. | William Thomson (Lord Kelvin) | William Thomson (Lord Kelvin) | November 17, 1874 | US156897 |
| Improvements in transmitters and receivers for electric telegraphs | 178/17B | Transmitting two or more telegraphic messages on the same line simultaneously using different frequencies | Alexander Graham Bell | Himself and Thomas Sanders; Gardiner G. Hubbard | April 6, 1875 | US161739 |
| Improvements in electric telegraphs for transmitting musical tones | 178/47 | Consisted of multi-tone transmitters, each tone being controlled by a separate telegraph key; conveying several messages through the same wire at the same time; and these can either be read by the operator by the sound, or a permanent record can be made by the marks drawn on a ribbon of travelling paper by a Morse recorder. | Elisha Gray | Elisha Gray; Samuel S. White | July 27, 1875 | US166096 |
| Improvements in telegraph-wires | 174/121R | Employment of strands of hemp or other fibrous substances, laid up around the wire in the form of a rope to give great longitudinal strength to the cable, while it is left sufficiently flexible. | Timothy Gordon | Timothy Gordon | April 4, 1876 | US175693 |
| Improvements in electric- telegraph apparatus | 178/3 | Automatically transmit a telegraph message recorded in a fillet of paper and to automatically reproduce facsimile copies of such record | Royal E. House | Royal E. House | July 25, 1876 | US180090 |
| Improvements in earth-batteries for electric clocks | 429/47 | An Earth battery is a pair of electrodes made of two dissimilar metals, such as iron and copper, which are buried in the soil or immersed in the sea. The Earth battery, in general, generated power for early telegraph transmissions and formed part of a tuned circuit that amplified the signalling voltage over long distances. | Daniel Drawbaugh | Daniel Drawbaugh; Theodor Grissinger; Jacob H.Grissinger | January 14, 1879 | US211322 |
| Improvement in self-adjusting relays | 335/274 | Relays constructed so that currents passing through them will govern the spring of the armature and cause it to adjust itself to the force applied by the current being either very strong or very weak. | Peter S. Bates | Peter S. Bates | October 7, 1879 | US220333 |
| Combined telegraph and clock system | 178/49 | To enable automatic transmission of time signals and telegraphic signals so they will not conflict with each other | Charles E. Buell | Charles E. Buell | June 12, 1883 | US279327 |
| Printing-telegraph | 178/34 | Automatic telegraph translator of the Morse code signals into alphabetical letters using only one wire | Jean Maurice Emile Baudot | Jean Maurice Emile Baudot | August 21, 1888 | US388244 |
| Duplex Telegraph | 370/297 | Quadruplex telegraph: Enable two operators to simultaneously send telegraphic signals over one wire in one direction by reversal of a battery current in one case and increasing and decreasing the current in the second instance. By combining this system with any system that simultaneously doubles the transmission in opposite directions, four transmitter operators and four receiving operators can work at the same time. (Foreign patents: Great Britain No. 384 (1875); France No. 107859 (1875); Italy No. 2940, 7803 (1875); Austria-Hungary No. 2936, 14584 (1875); Russia No. 3163 (1878).) | Thomas A. Edison | Western Union Telegraph Company | August 9, 1892 | US480567 |
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