Patents provide ownership rights to ways of doing things. Lack of coordination in national practices for awarding patents may result in discrimination against foreign patent applications; and may also cause infringement, in whole or in part, of existing inventions because of the unmanageable problem of document search.
In the Middle Ages, the concept of intellectual property rights amounted to an injunction by master craftsmen on journeymen not to use techniques they had observed in their apprenticeship. In 1790 the USA passed the first modern patent Act, France followed suit in 1791, and intellectual property rights became a European cause célèbre up until the middle 1800's.
A controversial patent was given to an American for observing that a hormone that is already checked during pregnancy tests has a previously unknown significance. This information is diagnostically important and commercially potentially rewarding. The patentholder did not invent the natural functioning of this hormone; therefore it is claimed that the patent was wrongly awarded.