Originally posted by sonhouse
Ok, here is the situation. I made a device that reads a vacuum sensor. That sensor, called a 'Capacitive Manometer' puts out a voltage from zero to 10 volts DC. Zero meaning very low vacuum and 10 volts meaning the maximum reading for that particular device, which can vary from device to device. Some devices 10 volts = 1000 Millitorr (a vacuum reading) and ...[text shortened]... to do so, or am I totally out of luck when it comes to owning anything I invent on company time?
I'm not a patent attorney and anything I say should not be construed as legal advice blah blah blah...
That being said, the "shopright doctrine" states that if you invent something in the course of your employment, the employee gets to keep and even patent the IP rights, but the employer maintains nonexclusive rights to use it. In other words, you would own the invention but your employer would have the right to use it. You could patent it and sell or license it as you choose to the rest of the world.
On the other hand, if your employer could show that they hired you to invent the portable device (or that this was contemplated as part of your job), the employer may be able to assert the right to the whole patent. That does not appear to be the case here.
Just from your description, I'd say there's an excellent chance that you can keep the IP rights to your invention but cannot stop your own company from using it (though you would be able to stop them from licensing it to others or sharing the technology with others).
Further reading:
https://supreme.justia.com/cases/federal/us/289/178/case.html
http://smallbusiness.findlaw.com/intellectual-property/law-regarding-the-rights-to-inventions-made-by-employees.html
http://www.nolo.com/legal-encyclopedia/who-owns-patent-rights-employer-inventor.html
etc.
I would recommend that you speak to a patent attorney in your jurisdiction. They can be expensive, but if you want to protect your IP rights, you want to file as soon as possible, preferably when only the prototype exists. If someone else gets your idea and files first, you're going to have a heck of a time proving that it was your invention. Note in this vein that an "idea" is not patentable, so even if you can show it was your idea that would not help. It's the process or design that is patentable. So filing first is very important.
Please note of course again that I am not a patent lawyer and am probably not licensed in your state and nothing I say may be taken or construed as legal advice.