In SE comments elsewhere 1, 2, 3 I talked about barriers of mixing advertising and spaceflight at NASA. In one I said:
...I'm not sure if Kubrick include any advertisements in his visionary extrapolation of what spaceflight would be like in this century in the 1968 film 2001: A Space Odyssey....
I've seen the film several times but a long time ago, including when it was first released, and I have a sense that there might have been oblique references to corporations, but that there were no corporate logos shown or company names mentioned.
This might have been partly as a cinematic technique; removing things familiar helps the audience's feeling that they are in a different time, but with Kubrick's attention to reality looking realistic, it seems like he might have snuck some in there.
Did Kubrick's film (Wikipedia, IMDb) or his and Clarke's screenplay make any reference to the names of companies, or show any evidence of the existence of advertisements for the future year 2001?