Selling an idea without a patent
Every line in which a company here mentions patents, quoted from its own page: who wants one before they look, and who does not ask.

What they say about patents
“Although not necessary, if you have a patent, let us know.”
“If your idea is covered by any patent, trademark, copyright, or other intellectual property right, you must identify those rights specifically and disclose them to us.”
“In order to submit a product idea to Radio Flyer, you must have a published utility patent application or issued utility patent.”
“Unfortunately, we cannot consider submissions of non-patented ideas, designs (including design patents), artwork, advertising or marketing suggestions, copyright registrations, slogans, logos, brands, trademarks or similar information.”
“Any submission may be used by Samsung without restriction for any purpose whatsoever, including, without limitation, reproduction, disclosure, transmission, publication, broadcast or posting, and you hereby irrevocably waive, release and give up any claim that any use of such submission violates any of your rights, including, without limitation, copyrights, trademarks, patents, moral rights, privacy rights,…”
“Connect + Develop helps P&G engage with innovators and patent-holders to meet needs across the P&G business: for products, technology, in-store, ecommerce and the supply chain.”
“Please list all patents or patent applications or intellectual property rights that cover your submission.*”
“This form asks for your contact information, your Patented Idea and for information concerning your granted or issued patent.”
“However, Colgate is willing to discuss early stage general and non-confidential ideas before a patent filing has been made or before it has been published.”