Humanities › History & Culture African American Inventors Share Flipboard Email Print Alcorn Patent #4,172,004. USTPO Archives History & Culture Inventions Famous Inventors Famous Inventions Patents & Trademarks Invention Timelines Computers & The Internet American History African American History African History Ancient History and Culture Asian History European History Genealogy Latin American History Medieval & Renaissance History Military History The 20th Century Women's History View More By Mary Bellis Inventions Expert Mary Bellis covered inventions and inventors for ThoughtCo for 18 years. She is known for her independent films and documentaries, including one about Alexander Graham Bell. our editorial process Mary Bellis Updated January 27, 2019 There have been many famous African American Inventors who have altered history due to their advancements to fields such as education, science, agriculture, and communication. There are over twenty African American inventors listed below including the unique patent number(s) assigned to their inventions. William B Abrams #450,550, 4/14/1891Abrams developed the Hame Attachments Part for a draft horses' collar. This is a curved hinge worn on any side of the mouth of a horse or other working animal, such as a cow or pig, that holds the mouth bit to better help the animal in the field. Elijah Abron #7,037,564, 5/2/2006Abron created substrate sheets with a removable strip that helped to bind papers together. Christopher P. Adams #5,641,658, 6/24/1997Adams put together a method for performing amplification of nucleic acid with two primers bound to a single solid support. This is useful in several ways, for example, for hybridization assays. James S Adams #1,356,329, 10/19/1920Adams allowed for airplane propelling means. This created the opportunity for blades to rotate parallel to airflow, in order to lessen a possible drag, if an engine failure were to occur. George Edward Alcorn #4,172,004, 10/23/1979Alcorn developed a method for forming dense dry etched multi-level metallurgy with non-overlapped vias.#4,201,800, 5/6/1980Alcorn also created a hardened photoresist master image mask process.#4,289,834, 9/15/1981Alcorn is responsible for developing a dense dry etched multi-level metallurgy with non-overlapped vias.#4,472,728, 9/18/1984In this patent, Alcorn created an imaging X-ray spectrometer.#4,543,442, 9/24/1985Alcorn developed the GaAs Schottky barrier photo-responsive device and method of fabrication.#4,618,380, 10/21/1986Another patent by Alcorn included the method of fabricating an imaging X-ray spectrometer. Nathaniel Alexander #997,108, 7/4/1911Nathaniel Alexander created the first folding chair for use in churches, school, and group gatherings. Ralph W Alexander #256,610, 4/18/1882This method of planting allowed each hill of two, three or four seeds to be the same distance. This cultivated rows in various directions and also kept a field weedless. Winser Edward Alexander #3,541,333, 11/17/1970Alexander developed a system for enhancing fine detail in thermal photographs; his research furthered expertise in the area of digital signal processing. Charles William Allen #613,436, 11/1/1898Allen created the self-leveling table. This allows for table stabilization and prevents wobbling. Floyd Allen #3,919,642, 11/11/1975Allen provided a low-cost telemeter for monitoring a battery and DC voltage converter power supply. James B. Allen #551,105, 12/10/1895Allen developed a clothes-line support. Modern-Day clothesline support is often adjustable and keeps lines secure to prevent sagging and dipping. James Matthew Allen #2,085,624, 6/29/1937Allen put together a remote control apparatus designed for radio receiving sets. John H Allen #4,303,938, 12/1/1981Allen created a pattern generator for simulating image generation. John S Allen #1,093,096, 4/14/1914Allen developed a package-tie to strap and secure packages. Robert T Allen #3,071,243, 1/1/1963Allen is responsible for the vertical coin counting tube patent. Tanya R Allen #5,325,543, 7/5/1994Allen developed the undergarment with a pocket for releasably securing an absorbent pad. Virgie M. Ammons #3,908,633, 9/30/1975Ammons invented the fireplace damper actuating tool. Alexander P Ashbourne #163,962, 6/1/1875Ashbourne put together a process for preparing coconut.#170,460, 11/30/1875Ashbourne also developed a biscuit cutter.#194,287, 8/21/1877Along with preparation, Ashbourne developed a process of treating coconut.#230,518, 7/27/1880Ashbourne is responsible for the refining coconut oil patent. Moses T. Asom #5,386,126, 1/31/1995Asom developed semiconductor devices based on optical transitions between quasibound energy levels. Marc Auguste #7,083,512, 8/1/2006Auguste invented a coin and token organizing, holding and dispensing apparatus.