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In the patents related to these devices, Paraskevakos also proposed to send [[alphanumeric]] information to the receiving apparatus, such as the caller's name, and also to make feasible banking by telephone. He also proposed to identify the calling telephone by special code (e.g., "PF" for public phone, "HO" for home phone, "OF" for office phone, "PL" for police).
In May 1976, [[Kazuo Hashimoto]], a prolific Japanese inventor with over 1000 patents worldwide,<ref>[http://web.archive.org/web/http://www.phonetel.com/html/hashimoto.html PhoneTel Patent Services :: History : Hashimoto]</ref> first built a prototype of a caller ID display device that could receive caller ID information. His work on caller ID devices and early prototypes was received in the [[Smithsonian Institution]], [[National Museum of American History]] in 2000.<ref>[http://siris-archives.si.edu/ipac20/ipac.jsp?session=11UV62L312150.21979&profile=all&uri=link=3100007~!202368~!3100001~!3100002&aspect=Browse&menu=search&ri=2&source=~!siarchives&term=Caller+ID+telephone+service&index=#focus PhoneTel Collection, 1954-1994]</ref> U.S. patent 4,242,539, filed originally on May 8, 1976, and a resulting patent re-examined at the patent office by AT&T, was successfully licensed to most of the major telecommunications and computer companies in the world.<ref>[http://www.highbeam.com/doc/1G1-16909535.html Fight heats up over patents on Caller ID. (Kazuo Hashimoto) - Communications News - HighBeam Research</ref>
Initially, the operating telephone companies wanted to have the caller ID function performed by the central office as a voice announcement and charged on a per-call basis. John Harris, an employee of [[Northern Telecom]]'s telephone set manufacturing division in [[London, Ontario|London]], [[Ontario]] promoted the idea of having caller ID as a telephone set display. The telephone was coded ECCS for Enhanced Custom Calling Services. A video of his [[prototype]] was used to leverage the feature from the central office to the telephone set.
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