In the kitchen...
There is a recipe for Lambrecht's cheesecake, but it is not available to the public. The recipe is kept secret to make it unique.
Yes, but a recipe might be better kept as a trade secret. A trade secret (like the recipe for Coca-Cola) can be maintained indefinitely. A patent, on the other hand, will eventually expire, meaning that anyone can use the recipe.
Secret Recipe was created in 1996.
President Wilson had a stroke. It was kept a secret.
Coca Cola claims to have the best kept secret in the world when it comes to the recipe they use to make Coke. However other companies have made that claim as well so it may or may not be true.
They aren’t kept secret.
Although the secret to the recipe for Milles Cookies is a company secret (the cookies are delivered in-store in frozen batches), it appears that the secret to a chewy-cookie is to use both brown and caster sugar in your recipe. A recipe using oil or melted butter will also make chewy cookies.
Secret Family Recipe - 2013 was released on: USA: 6 October 2013
Top Secret Recipe - 2011 was released on: USA: 7 October 2011
Remains a secret to this day.
Silk was kept secret b/c of its value
That my friend is top secret