If your product or service is fairly unique, an angel will want to see you've secured the patents, copyrights or trademarks to protect your intellectual property.

WSJ: How to Win Angel Investor Funding

Back to patents only for things which are non-trivial, non-obvious and new and unique please.

FORBES: Apple's Slide to Unlock Patent: Yes, the Patent System Needs Reform

Some are unique to the business, such as the strategic needs of the buyer or the existence of intangible assets such as patents and trademarks.

FORBES: Your company is profitable, but is it valuable?

Other patents deal with the isolation of enzymes important for industrial processes, the isolation of cellular compounds that guarantee unique properties (such as resistance to extreme pressure and salinity) and the discovery of mechanisms ensuring resistance to extreme temperatures and toxicity, these extreme properties being of interest for both biomedical and industrial applications.

UNESCO: MEDIA SERVICES