Patent US 4623819A

Patent number	US 4623819A (click link for details and documents via Google Patents)
Title	Accelerating and scan expansion electron lens means for a cathode ray tube
Inventors	Bozidar Janko, Norman R. Franzen, Myron A. Bostwick Jr.
Company	Tektronix Inc
Filing date	1985-08-12
Grant date	1986-11-18