Abstract: A glass substrate and method for making the substrate. A sheet of glass is formed by floating molten glass on a molten material such as tin. The sheet is cut into smaller pieces which are then cut into circular blanks. An inner opening is formed in the blank. Other steps such as sizing cuts and chamfering of the inner and outer diameter may be performed. The blanks are ground or polished only a minimal amount or are not ground or polished, thus providing for economical manufacture. Various cleaning and chemical treatment steps may also be performed.

Abstract: The wedge clamp (28) engages on the end of a heatsink (18) and engages within a channel shaped recess (24, 26) in the coldwall. The wedge clamp (28) is made up of a pair of wedges (32, 34) of the same angle driven together by a screw (48). This forces the wedge clamp surfaces (32, 34) apart to obtain a large heat transfer area and intimate contact with the coldwall surfaces (24, 26).

Abstract: Circuit module connection system for connection of a modular package (18) to a printed wiring board (12) has a contact (24) on the package and an aligned pad (16) on the board. A resilient contact (44) is positioned therebetween and is held in place and separated from adjacent contacts by means of contact retainer (34). The contact retainer (34) also has a seal flange (40) to resiliently seal out the environment. A thermal member (42) spaces the package from the board and permits heat flow out of the package.