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The Edwin Gray Mystery
In the mid-1990's, however, a research
associate of mine told me that he had heard
that Gray had been issued other patents and
this completely intrigued me. Would these
new patents contain the answers I was
looking for? I didn't know for sure, but I
knew I needed to get hold of these
documents. Unfortunately, my associate
didn't have them, and he didn't know what
the patent numbers were. So once again, my
search for Ed Gray's "cold electricity" came
to a dead end, at least for a few more years.
In June of 1999, while visiting the IBM
Intellectual Property Network on the internet
(now the Delphion Intellectual Property
Network), I noticed that the search engines
within the patent database had been recently
updated so it was now possible to restrict a
search just to the Inventor Line. "Gray" into a
search and looked at every word in every
patent from 1971 forward, you got so many
hits you couldn't possibly go through them
all. Now, however, I was able to plug "Gray;
Edwin" into the Inventor Line of this newly
updated search engine. Lo and behold, on my
screen 30 seconds later, the numbers of two
other patents that had been issued to Edwin
Gray came up. I was ecstatic!
Figure 11 shows the first of these patents
entitled "Efficient Power Supply Suitable for
Inductive Loads" issued in June 1986.
Understanding this patent will be the primary
focus of this book.
The other patent entitled "Efficient
Electrical Conversion Switching Tube
Suitable for Inductive Loads" (Figure 12)
was issued approximately ten months later,
in April 1987.
These two patents are very closely
linked and are almost identical. One of them
describes the circuit that drives this switching
tube and the other one describes the
switching tube itself. About 80% of
Figure 11
Gray's Circuit Patent Cover Sheet
Figure 12
Gray's Conversion Tube Patent Cover Sheet
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