Patent US 3453403A

Patent number	US 3453403A (click link for details and documents via Google Patents)
Title	Power selection device
Inventors	Eldon Hoffman
Company	Tektronix Inc
Filing date	1966-08-18
Grant date	1969-07-01

Related products:

Manufacturer	Model	Description	Introduced	Designers
Tektronix	115	Pulse generator	1968
Tektronix	1340	Data Coupler	(?)
Tektronix	140	NTSC signal generator	1969
Tektronix	141	PAL signal generator	1969
Tektronix	144	NTSC signal generator	1971
Tektronix	145	PAL genlock test signal generator	1973
Tektronix	146	NTSC signal generator	1971
Tektronix	147	NTSC signal generator	1971
Tektronix	148	PAL signal generator	1971
Tektronix	149	NTSC signal generator	1973
Tektronix	2101	25 MHz pulse generator	1970
Tektronix	230	Digital Unit	1967
Tektronix	2601	2601 Mainframe	1971
Tektronix	284	Pulse generator	1967	Fred Kawabata
Tektronix	286	Sampling head multiplexer	1970
Tektronix	4501	Scan converter	1969	George Edens • Chuck Gibson
Tektronix	453	50 MHz portable dual-trace scope	1965	Oliver Dalton • Gene Andrews
Tektronix	454	150 MHz portable dual-trace scope	1967	Oliver Dalton • Carl Battjes
Tektronix	491	40 GHz Spectrum Analyzer	1966	Gene Kauffman
Tektronix	5030	1 MHz diff-input dual-beam scope	1969	Val Garuts
Tektronix	5031	1 MHz diff-input dual-beam storage scope	1969	Val Garuts
Tektronix	520A	NTSC/PAL vectorscope	1973	Phil Crosby • Ron Olson
Tektronix	521A	PAL vectorscope	1973	Phil Crosby • Ron Olson
Tektronix	522	Vectorscope	1970	Phil Crosby • Ron Olson
Tektronix	545B	30 (33) MHz oscilloscope	1964	John Gates • Dave Barton • Bob Shand
Tektronix	547	50 MHz oscilloscope	1964	Bob Rullman • Keith Taylor • John Gates • Gene Kauffman • George Smith
Tektronix	556	50 MHz dual beam scope	1966	Phil Crosby • Larry Biggs • Ron Olson • Arend Kastelein
Tektronix	561B	10(4) MHz "General Purpose Scope"	1969	Bob Shand
Tektronix	564B	Split-screen storage scope	1969	Bob Shand
Tektronix	568	Sampling scope	1967
Tektronix	576	Curve tracer	1969	Jim Knapton
Tektronix	611	11" CRT storage monitor	1967	Norm Winningstad • Dan Denham • Carlo Infante • Stu McNaughton • Walt Lowy • Leo Heineck
Tektronix	647A	100 MHz scope	1967
Tektronix	7503	90 MHz non-storage mainframe	1970	Phil Crosby • Hans Springer
Tektronix	7504	90 MHz non-storage mainframe	1969	Wim Velsink
Tektronix	7704	150 MHz non-storage mainframe	1969	Gene Andrews • Bob Shand
Tektronix	7704A	200 MHz non-storage mainframe	1972	Luis Navarro • Bob Shand • Bill Lukens • Jim Cavoretto • Bill Markwart • Dave Hoskins • Bill Gordon • Phil Lloyd • Dick Swanson • Larry Pearson
Tektronix	7904	500 MHz non-storage mainframe	1971	Val Garuts • Thor Hallen • John McCormick • Les Larson • Bill DeVey • Bill Peek • Hans Springer • Joe Burger • Joel Swanno • Ken Hawken
Tektronix	P6042	DC−50 MHz current probe	1967	Cal Hongel
Tektronix	P7001	Digitizer for the 7704A oscilloscope	1973	Hiro Moriyasu • Luis Navarro • Bruce Hamilton • Jack Gilmore • Bob Shand • Bruce Hamilton • Jack Robinson • Bill Lucas • Jack Grimes • Dennis Keldsen • Mohamed Saba • Dick Beatty • Wayne Eshelman • George Rhine • Bill Markwart • Marlow Butler • Carl Dalby • Colin Doward • Gale Byers • Jim Gerakos
Tektronix	R7903	500 MHz non-storage mainframe	1974	Val Garuts • Thor Hallen • John McCormick • Les Larson • Bill DeVey • Bill Peek • Hans Springer • Joe Burger • Joel Swanno • Ken Hawken

This patent describes the trapezoid-shaped line voltage selector found on many 1960s/1970s-era instruments, e.g. the 7503 and 7904.