Marvin Pipkin
Marvin Pipkin (Nov. 18, 1889 - Jan. 7, 1977), American chemist and inventor of two processes for inside frosting of incandescent lamp bulbs.
Born near Lakeland, Florida, Pipkin attended Alabama Polytechnic Institute and received a Batchelor of Science degree in Chemical Engineering in 1913 and a Master's in 1915. In 1917 Pipkin enlisted in the US Army [1] and was assigned work on gas masks. His wartime work was at the General Electric Nela Park laboratory in Cleveland where he remained after the war.
In 1925 Pipkin developed a process for etching the inside of a lamp bulb with acid, using a two-step process so that the lamp would not be excessively weakened. He obtained a patent for this invention, which was assigned to General Electric, but in a later suit for infringement, the patent was held invalid by the United States Supreme Court.[2] In 1947 a silica coating process also invented by Pipkin replaced the etching.[3]
Pipkin retired back to Lakeland in 1954, and died of cancer in 1977.
Patents
- (U.S. Patent No. 1,687,510) (invalidated in General Electric Co. v. Jewell Incandescent Lamp Co., 326 U.S. 242 (1945))
- (U.S. Patent No. 2,545,896)
References
Pipkin biography retrieved 2006 June 27
- ↑ "Archived copy". Archived from the original on May 21, 2011. Retrieved March 21, 2008. Marvin Pipkin's induction card retrieved March 21, 2008
- ↑ General Electric Co. v. Jewell Incandescent Lamp Co., 326 U.S. 242 (1945).
- ↑ Incandescent Lamps, General Electric Technical Publication TP 110,Nela Park, 1964 page 3