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| Number | Title | Issue Date |
| 4779459 | Gas meter including a synthetic membrane A gas meter includes a housing made of thermoplastic material having an inside wall defining two measuring chambers and a deformable membrane disposed between the two measuring chambers. The deformable membrane is formed from a film of thermoplastic elast... | 10/25/1988 |
| 4136603 | Diaphragm assembly A diaphragm assembly for use in highly corrosive industrial applications includes a metal body subject to corrosion and a diaphragm formed of a corrosion resistant metal. The metal of the diaphragm is metallurgically incompatible with the body metal. The ... | 01/30/1979 |
| 4107485 | Device for completing an electric circuit or the like for a lock or the like As a requirement for the opening of a lock or similar security device, an operative group of partially series-interconnected switches is required to be completely series-interconnected, i.e. placed in a closed circuit relation. However, in contrast to a t... | 08/15/1978 |
