I'm afraid you are looking at a two-step process at best. First look up the catalog for the bicycle in question to find out what rims came with it. Then search the internet for information on the particular rim. I know there are a couple databases out there for current production rims but don't know of any for older rims.

However, the process I have outlined above can break down in any number of ways:
Catalogs often don't list the rim make and model.
Manufacturers have a funny habit of changing components like rims mid-year so the catalog might not be accurate.
Rims often suffer damage and are replaced, often with a non matching rim.

Brent