Opera hat described as: Some sources have taken this to describe an early folding top hat, although it is not explicitly stated whether Dollman's design was specifically for male or female headgear. Dollman's patent expired in 1825. Operating from Poissy, Paris, France, around 1840, Antoine Gibus's design for a spring-loaded collapsible top-hat proved so popular that hats made to it became known as "gibus". They were also often called "opera hats" due to the common practice of storing them in their flattened state under one's seat at the opera, though the term can also refer to any tall formal men's hat. The
Top Hat (company) Top Hat (company) Top Hat is a Canadian educational software company with its headquarters in Toronto, Ontario, Canada, and a second office in Sydney, Australia. Top Hat hosts a library of interactive college textbooks that students read on their mobile devices, and a platform designed for teachers to check attendance with additional products for student engagement, assignments and activities. Students pay to use the app per semester or over longer periods, and universitywide licences are also available. Co-founders Mike Silagadze and Mohsen Shahini started Top Hat in 2009 in Waterloo, Ontario, to tackle problems with student concentration and mobile devices