While your list was informative I found that you 
happened to list a lot of "conception" credit 
instead of just giving credit to the person that 
made it happen. I guarantee you that anyone who 
claimed credit for just the concept of something 
had been beat to it by people long before them. 
Look at all the concepts Leonardo DiVinci came up 
with! In this area I say give credit to the 
person who makes the idea reality. 
 And since the person who listed American 
inventions seemed to be a little off-track let me 
help them out...
1972-73 Recombinant DNA tecnology
1852 Elevator
1976 Supercomputer J.H. Van Tassel
1911 Air Conditioning W.H.Carrier (God bless this 
man!)
1958 Laser Gordon Gould
1947 Microwave oven
1954 The Solar cell
1885 Transformer William Stanley
1948 LP record
1956 Viedotape
1922-26 Sound motion pictures
1893 Movie projector
1888 Kodak cameria
1884 Flexible roll film
1972 Electronic calculators
1787 Steamboat John Fitch
1942 Nuclear reactor
1955 Carbon dating
1971 Nuclear magnetic resonance imaging
1904 Bottle making machinery Michael J. Owens
... and the more well known stuff like 
Typewriters, the Telephone, the Phonograph, 
Microphone, Morse Code and the Telegraph.
And finally inventions we should not be proud 
of...
1945 Atomic Bomb
1952 Hydrogen Bomb
1958 Neutron Bomb