With the help of
Marcel Grossmann's father Einstein secured a job in Bern at the
Federal Office for Intellectual Property, the patent office,
[42] as an assistant
examiner.
[43] He evaluated
patent applications for a variety of devices including a gravel sorter and an electromechanical typewriter.
[44] In 1903, Einstein's position at the Swiss Patent Office became permanent, although he was passed over for promotion until he "fully mastered machine technology".
[45]
Much of his work at the patent office related to questions about transmission of electric signals and electrical-mechanical synchronization of time, two technical problems that show up conspicuously in the
thought experiments that eventually led Einstein to his radical conclusions about the nature of light and the fundamental connection between space and time.
[46]