An electric circuit assembly (12) includes a ceramic tub (14) having a floor (16) and an integral side wall (18) around the perimeter thereof and extending upwardly therefrom. Copper lead frames (20, 22, 24), are directly and hermetically bonded to the bottom of the tub floor at apertures (40, 42, 44)...http://www.google.com.au/patents/US4902854?utm_source=gb-gplus-sharePatent US4902854 - Hermetic direct bond circuit assembly
