Feasibility is a mandatory requirement for the granting of a patent; if a patent is granted despite a lack of feasibility, this constitutes grounds for invalidity.

Behind the patenting process lies the deal "disclosure in exchange for monopoly," i.e., the invention must be available for use by everyone after the patent term expires.

The decisive date for assessing feasibility is the filing date; subsequent submissions of essential technical content cannot contribute to feasibility.

The description must be clear enough that a specialist can implement the invention without unreasonable effort.