[D8120ZBU], Memorandum, Benjamin Franklin Butler, November 29th, 1881


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[D8120ZBU], Memorandum, Benjamin Franklin Butler, November 29th, 1881

Editor's Notes

Summarizes and quotes from Butler's opinion on validity of American Electric Light Co's patents. Butler claims that AEL Co. does not infringe anybody else's patents and is clear to make and sell electric lights without fear of losing an infringement suit. Also Butler claims that there exist many dynamo machines which can be used without paying royalties, because they are old enough to be in public domain. Butler says that AEL's patent on device for evacuating air from receiver is both valuable and sustainable. Document also contains comparison of the vacuum created by Geisler, Sprengel, and AEL's pumps. United States Electric Lighting Co. uses Geisler; Edison uses Sprengel; claims that AEL's pump yields better vacuum. Consider for inclusion: contains good info on state of art, patent situation, and competitive environment. (DH)




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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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