According to these links, they will probably work in an actual case. They can be revoked at any time, making them inapplicable to future patent use which was not already going on for some period of time.
Definitely not anywhere near as binding as the MIT license, but it's not a good comparison anyways, MIT addresses only covers only copyright and patent law is a very different and separate area of law.
According to these links, they will probably work in an actual case. They can be revoked at any time, making them inapplicable to future patent use which was not already going on for some period of time.
http://en.swpat.org/wiki/Equitable_defence, http://en.swpat.org/wiki/Patent_promises
Definitely not anywhere near as binding as the MIT license, but it's not a good comparison anyways, MIT addresses only covers only copyright and patent law is a very different and separate area of law.