I posted this one a few years ago:
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Throttle Body Fuel Injection (TBI) , by Lauren L. Bowler, Engineering Staff, GM Emission Control System Project Center, SAE paper 800164, 2-1-1980.
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and here's another to add to the thread on US Patent 4,149,496:

http://patft.uspto.gov/netacgi/nph-P...6&RS=4,149,496

and just for fun here's the one (US Patent 5,558,061) for the LS1 head (as it evolved from the LT1):

http://patft.uspto.gov/netacgi/nph-P...1&RS=5,558,061

I haven't found TPI yet but it's probably in there somewhere....

EDIT on US Patent 4,664,075:

http://patft.uspto.gov/netacgi/nph-P...S=PN/4,664,075

 

wasn't cadallic the first line of GM to have TBI?

 

Yes. In the 8-6-4 Cad engine.

 

Well, USPTO contains a treasure trove of technology. Here are some EFI related patents in PDF file format:

 

and couple more:

 

High squish, dual swirl engine combustion chamber

4,452,221

viewable either at USPTO or here: http://www.pat2pdf.org/pat2pdf/foo.pl