There are a number of saints named Thomas so you need to be more specific.
The Patron Saint Index shows no patron saints of courage, including Saint Thomas.
SAINT THOMAS MORE Is PATRON SAINT OF POLITICAL LEADERS
The patron saint of geometricians is Thomas Aquinas.
Thomas Becket is the patron saint of:clergyExeter College, Oxford, EnglandPortsmouth, Englandsecular clergy
Both Saint Joseph and Saint Peter are the patron saints of the Universal Church.
There is no specific patron saint of ideas, but St. Thomas Aquinas is often associated with intellect and learning. He is considered a patron saint of students and scholars.
Saint Apollonia is traditionally considered the patron saint of land surveyors. She is also the patron saint of dentists and those suffering from toothaches.
Saint Thomas Becket is the patron saint of England. He was the Archbishop of Canterbury in the 12th century and was martyred for his defense of the church's independence from the monarchy.
Sir Thomas More
Saint Thomas the apostle and Saint Barbara are the patron saints of architects The patron saints of architects are:
Thomas the Apostle is the patron saint of:against blindnessagainst doubtarchitectsblind peoplebuildersCertaldo, Italyconstruction workersCeylonEast IndiesgeometriciansIndiamasonsPakistanpeople in doubtSri Lankastone masonsstonecutterssurveyorstheologians
St. Albert the Great, while not the patron saint of science is the patron saint of scientists. He was the teacher and mentor of St Thomas Aquinas.