If you described a new apparatus or method in your thesis, and your thesis was published less than one year ago, you may be able to file a US patent application on your invention. I assume your thesis is directed to a "hard" science, such as chemistry, physics, engineering, medicine, etc. Even discoveries described in "softer" science theses, such as psychology, can sometimes be patented, such as testing or treatment methods or apparatus. However, if your thesis has already been published (for example, made available through the library of your university), you may not be able to file a patent application in most countries outside the US. In addition, some countries limit or do not permit patenting medical procedures.

Your university probably has a technology transfer office ("TTO," sometimes call a technology licensing office or commercialization office) that can help you with a patent application. Your university may require you to work through such an office and/or transfer ownership of any patent application to the university. This may depend on whether you received a fellowship or who paid for your research.

In any case, a patent attorney can prepare a patent application that describes your invention, with enough detail to enable one of ordinary skill in the field how to make and use the invention. Many, maybe all, of these details should be in your thesis. A patent application is not merely a form to fill out!

Patent applications are expensive, so usually university TTOs will choose which inventions to try to patent, possibly based on which inventions the TTOs feel have the best chance of being licensed by a third party. Some universities liberally file patent applications with the hope of licensing the technology to their graduate student(s) (and sometimes professor/advisers) with the hope the students/advisers will start businesses, make lots of money and pay royalties (or make donations) to the university.

Talk to a Patent Attorney....

yes, I recommend that you take professional advises from a patent attorney.

Assuming your thesis is available to the public in some way, e.g., it's in a library, then (other than possibly USA), there is no chance of getting a patent anywhere. You should have discussed the matter with your supervisor before you submitted your thesis! The advice given by others above is accurate.

I will echo the other post in seeking professional advise. The claim over IP hat you or the University can have will depend on the IP policy of the University. The most likely clause in there will be on use of resources. If you did all the work on your own , then what claim does the University have? The answer is based on what is written in the policy.

Regards