In the Royal Society's biographical memoir of Dennis Gabor, F.R.S., only a brief reference was made to Gabor's numerous patents, as when it was written there had been insufficient time to study all of them in the Patent Office. However, an opportunity to collect all the patents and review them was presented when three US students from Worcester Polytechnic Institute, Worcester, Massachusetts, visited City University in 1988 to undertake their ‘Interactive Qualifying Project’ as part of their degrees and were given by one of the authors the task of studying Gabor's patents. They listed 16 German, 31 Canadian, 62 British and 63 US patents. It was not possible in the time available to get the German patents translated, copies of the Canadian patents were not readily available in London, and 60 per cent of the US patents mostly duplicated the British ones. However, the full titles and filing dates of all 172 patents were recorded, and abstracts of the British and US patents were written. The whole was woven into a brief life of Gabor. A copy of the students' report is lodged with the Gabor Archive at Imperial College, London. This review of Gabor's patents makes full use of the students' work; the list of patents, filing dates, etc., are copied with only small changes, and use has been made of some of the abstracts.