Artifact Details


Fok patent notebook (#438)

Catalog Number







Fok, Samuel M.

Biographical Notes

Samuel (Sam) Fok (Ph.D.) worked for Shockley Semiconductor and joined Fairchild in February 1960. Initially he worked as a member of Jay Last’s Micrologic development team on isolation techniques and masking waxes. He developed an IR method to permit alignment of masks required for mechanical isolation from the rear of the wafer. Later he became a specialist in photo resist technology and developed many aspects of masking and photolithography. A Member of the Technical Staff reporting to H. Sello, Manager of the Materials and Processes Deptartment, circa 1966 he was responsible for building the in-house designed Mark III S R (step and repeat) Camera that was used for several years before comparable commercial machines were available. The 1967 organization chart shows him as a Member of the Technical Staff (MTS) reporting to Harry Sello, manager of the Materials and Processes Department. Fok filled 12 notebooks (8 patent books, 4 laboratory books) covering the decade from 1960 to 1970. They contain highly detailed records of his and other departmental activities within the company over this period.


Fairchild Semiconductor

Identifying Numbers

Document number 438


Approximately 144 dated entries over 144 pages.


12 x 10 inches


This patent notebook is identified as #6 on spine. Fok continues his detailed entries on the topics of photo resist technology, lenses and mask making from book #5. Includes extensive analysis of requirements for a next generation step and repeat (S&R) camera and comparison with a D.W. Mann repeater system. Other notes include: a foldout chart of XM2 SR camera program project (p. 19); a meeting to discuss the project - that commenced on 1965-12-08 (p. 21); and a drawing of a proposed “Mark III SR as visualized by me” (p. 144).



Collection Title

Fairchild Semiconductor notebooks and technical papers


The author contributed to the following R&D Technical Reports (TR) and papers in professional publications during his service at Fairchild:

TR45 The Electrochemical Society Meeting (1961-04-30-1961-05-03), Indianapolis (1961-06-01).

TR173 International Conference on Photographic Science and Engineering. (1964-04-27-1964-05-01), New York City (1964-05-15).

TR185 In-house capability of fly's-eye lens technique (1964-08-21).

TR349 Microphoto mask making - present and future (1968-08-12).

Anderson, R. C., Crippen, R. E. and Fok, S. M. Micrologic System Design Considerations. Sixth National Conference on Microelectronics, Washington D.C. (1962-06-25-1962-06-27): Also published as Fairchild TP-22.


Gift of Texas Instruments Incorporated

Lot Number