Outer Right Join?

I’m looking for a three-table join. The SQL that I have isn’t working.

companies table - list of companies
products table - list of products sold by those companies
contracts table - list of companies that hold ad contracts

I need to ask:

"Show me the queried product (i.e.: Screwdriver) listings with their company names that DO NOT have contracts"

SELECT DISTINCT ON ("listings"."product")
"listings"."product", "companies"."name"
FROM "listings"
RIGHT OUTER JOIN "contracts" ON ("contracts"."companyid" = "listings"."companyid")
LEFT JOIN "companies" ON ("companies"."scid" = "listings"."companyid")
WHERE (("listings"."product" ILIKE '%screwdriver%' ESCAPE '\'))

The result works without the RIGHT OUTER JOIN in there. When the RIGHT OUTER JOIN is in there, I get a hitlist of zero. Currently I have no contracts in that table, so those two queries should be the same. They are not.

To repeat, I want any company’s products that are in the contracts table, to not show up. “products with no contract”.

Any inside as to how I can get this to work, appreciated.

Cheers, Bee