Use of TM or SM is recommended to indicate a claim of ownership. Use of is allowed only after obtaining Federal registration. Register the mark to obtain significant procedural advantages. To the extent you can keep an idea confidential within your organization, if the idea is not otherwise available to your competitors or the public, the idea can be protected as a trade secret. The Coca-Cola formula is a good example.
Trade secrets can have an indefinite life.
Trade secrets law is generally State law. While the standards may vary, generally all States require that positive steps be taken in identifying trade secrets information as such, and in maintaining limited access. Implement the policy and monitor compliance. Have agreements with employees, contractors and consultants covering confidentiality and non-disclosure. There are three types of patents in the United States, namely utility patents, design patents, and plant patents.