who (what) was hazeltine research inc.

They did much of the developmental work on NTSC color. So much so that they are listed on the patent notice label of every CT-100. Here are two bits of trivia about their participation. As of 1999, the name had survived a number or mergers.

[1] On October 15, 1953, thirteen manufacturers showed 15-inch NTSC color television sets to the FCC and press. Here’s a list of companies who demonstrated working sets that day at New York’s Waldorf=Astoria hotel:
Admiral
CBS
Crosley
Emerson
General Electric
Hallicrafter
Hazeltine
Motorola
Philco
RCA
Sylvania
Westinghouse
Zenith


[2] In the fifties, the Hazeltine Company on Long Island, New York developed a system for viewing motion picture negatives as a positive on a tricolor screen, so the image on the display CRT was like looking at a film on a screen in a theater.

The earliest analyzers are now all gone -- the last survivor was an all-tube design from the late fifties still running in India in 1995 that ultimately used a 21FJP22.

Later, a Mexican company traded in a CRT analyzer that was totally inoperable, but it had Hazeltine's very first display, the RCA 15GP22.

IIRC, Hazeltine also had some patents that went back to the early days of Radio-Much to RCA's & General Sarnoff's chagrin.

You can find there name on the patent notices of many/most radios of the thirties and later. I think that had to do with superheterodyne circuits. I have read some history on them, and some internet searching could very likely bring up much interesting reading.

A little more on Hazeltine from Wikipedia;

Hazeltine Research; http://en.wikipedia.org/wiki/Hazeltine_Corporation

Louis Alan Hazeltine; http://en.wikipedia.org/wiki/Neutrodyne
(with a few tips on how to neutralize your Neutrodyne receiver.

Dave A

THANKS ALL for info! the tv (12" roundie b/w silvertone console) first post on 12-13-2006 had this on a label(rca and hazeltine patents)never heard of them before.still trying to find exact year model of tv.just trying to narrow it down.

They did much of the developmental work on NTSC color. So much so that they are listed on the patent notice label of every CT-100.

Hazeltine contributed the principle of 'constant luminance' to the NTSC color system, and they also came up with another method called 'shunt brightness' or 'bypassed brightness', all of which have to do with the ratios and values of the RGB components making up the luminance signal.

I have looked for years but have never been able to find any reading material
on these methods.
If anyone can direct me to a book or other source from Hazeltine about this topic, I would greatly appreciate it.

I am also curious about the demise of Hazeltine Research.
All I have read is that the company went under because of the extremely high costs of damages resulting from legal actions against them.

What was all this about?

Regards,
Cliff

still trying to find exact year model of tv.just trying to narrow it down.
You probably know this, but patent dates are an imprecise way of dating an old TV or radio.

If you see a patent date (or number) on a label, that means the device could not have been made before the patent was granted. But it could have been made a considerable time after that date, since patents, and licenses to use patented technology, remain in force for years.

Phil Nelson