Most employers have no desire to sue employees, so most of these settle or get ignored, AFAIK.
At least in the case of Google (literally, i have no concept of other Alphabet companies), the only cases i'm aware of where Google has claimed it owned something was when the employee sued Google first.
example: A former employee suing Google over a patent developed while employed by Google, google counterclaims it owns that patent under the IP agreement.
Most employers have no desire to sue employees, so most of these settle or get ignored, AFAIK.
At least in the case of Google (literally, i have no concept of other Alphabet companies), the only cases i'm aware of where Google has claimed it owned something was when the employee sued Google first.
example: A former employee suing Google over a patent developed while employed by Google, google counterclaims it owns that patent under the IP agreement.