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Roberts patent notebook (#7)






Roberts, C. Sheldon

Biographical Notes

Cornelius Sheldon Roberts was born in 1926 in Rupert, Vermont. He received a B.S. in metallurgical engineering from Rensselaer Polytechnic Institute, located in Troy, New York in 1948 followed by an M.S. in 1949 and a Ph.D. in 1952 from MIT. He conducted metallurgical research at the Naval Research Lab and the Dow Chemical Company and joined the Shockley Semiconductor Laboratory in Mountain View, California, in 1956. With Robert Noyce and others Roberts founded Fairchild Semiconductor Corporation in 1957 where his primary focus was on silicon crystal production. He left with Jay Last to found Amelco Semiconductor, a division of Teledyne Inc. in 1961 where he developed solid-state transducers and an epitaxial silicon wafer program. Later Roberts consulted in materials and processes for the aerospace, electronic materials, metals, and microelectronics industries.


Fairchild Semiconductor Corporation

Identifying Numbers

Document number 7


Approximately 145 dated entries over 93 pages.


12 x 10 inches


This volume opens with one of the first entries written by any of the founders, a description of the plan the author has developed to establish a silicon crystal growing capability in the 844 Charleston Road building, including the features of the ingot puller he has designed. Notes on the growth of the first crystal on 1958-01-15 (p. 6). The material was cut up and given to Moore/Allison for “Project 100”. A total of 15 starts resulted in 6 usable single crystal ingots (p. 9). Succeeding pages are densely filled with detailed day-by-day accounts of his progress and issues together with (many loose) Polaroid photos of etched wafers and numerous results of resistivity measurements. Describes possible uses and issues with “aluminum pull-away” from silicon surface (pp. 23 - 25). Suggests that the presence of oxygen “is of more than incidental interest” on the bulk properties of silicon (p. 35), cites many references. Design calculations for NPIN transistor (p. 42). Experiments on neutron irradiation of NPN transistors to lower storage time (pp. 47-48). “Thoughts on contact alloying to diffused silicon transistors” (pp. 57-58).

This is 1 of 2 books issued to the author. The other book is Roberts (Un-numbered).


The author is named as inventor on 2 U.S. patents. 1 was assigned to Fairchild:

U.S. patent #3013955, “Method of transistor manufacture.” Filed 1959-04-29. Issued 1961-12-19.



Collection Title

Fairchild Semiconductor notebooks and technical papers


The author contributed to the following R&D Technical Report (TR), wrote articles for professional journals, and a textbook on magnesium during his service at Fairchild:

TR27 Effect on piezoresistive gage factors of stress transverse to principal substrate strain (1960-10-15).

Roberts, Sheldon., Magnesium and its alloys. John Wiley & Sons, 1960.


Gift of Texas Instruments Incorporated

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