Differential pressure transmitters

Claim 1

A DIFFERENTIAL PRESSURE TRANSMITTER, COMPRISING: AN OUTER HOLLOW GENERALLY SEALED HOUSING; A HOLLOW BODY MEMBER MOUNTED WITHIN SAID HOUSING AND HAVING A CENTRAL CHAMBER; FIRST BELLOWS MEANS MOUNTED BETWEEN ONE SIDE OF SAID HOUSING AND SAID BODY MEMBER FOR FORMING A FIRST OUTER CHAMBER BETWEEN SAID FIRST BELLOWS MEANS AND SAID ONE SIDE OF SAID HOUSING, AND A FIRST INNER CHAMBER BETWEEN SAID FIRST BELLOWS MEANS AND SAID BODY MEMBER THAT IS SEALED WITH RESPECT TO SAID OUTER CHAMBER; SECOND BELLOWS MEANS MOUNTED BETWEEN THE OTHER SIDE OF SAID HOUSING AND SAID BODY MEMBER FOR FORMING A SECOND OUTER CHAMBER BETWEEN SAID HOUSING OTHER SIDE AND SAID SECOND BELLOWS MEANS AND A SECOND INNER CHAMBER BETWEEN SAID BODY MEMBER AND SAID SECOND BELLOWS MEANS THAT IS SEALED WITH RESPECT TO SAID SECOND OUTER CHAMBER; SAID FIRST AND SECOND OUTER CHAMBERS BEING SEALED WITH RESPECT TO EACH OTHER; FIRST PASAGE MEANS FORMING FLUID COMMUNICATION BETWEEN SAID FIRST INNER CHAMBER AND SAID CENTRAL CHAMBER AND HAVING FIRST VALVE MEANS THEREIN FOR DAMPING AND PREVENTING FLUID PULSATIONS THROUGH SAID FIRST PASSAGE MEANS; SECOND PASSAGE MEANS PROVIDING FLUID COMMUNICATION BETWEEN SAID SECOND INNER CHAMBER AND SAID CENTRAL CHAMBER AND HAVING SECOND VALVE MEANS THEREIN FOR PREVENTING EXCESS DIFFERENTIAL PRESSURES; ROD MEANS DRIVINGLY CONNECTING SAID SECOND VALVE MEANS FOR MOVEMENT WITH SAID SCOND BELLOWS MEANS; A CANTILEVER ATTACHED TO SAID BODY MEMBER AND EXTENDING INTO SAID CENTRAL CHAMBER; STRAIN GAUGES BONDED TO SAID CENTILEVER AND HAVING ELECTRICAL CONNECTIONS EXTENDING THROUGH SAID BODY MEMBER TO THE OUTSIDE OF SAID HOUSING; INCOMPRESSIBLE FLUID FILLING SAID FIRST AND SECOND INNER CHAMBERS AND SAID CENTRAL CHAMBER; SAID FIRST INNER CHAMBER, SAID SECOND INNER CHAMBER AND SAID CENTRAL CHAMBER BEING SEALED WITH RESPECT TO SAID FIRST OUTER CHAMBER; SAID SECOND OUTER CHAMBER AND THE EXTERIOR OF SAID HOUSING; A CANTILEVER CONTACT MEMBER; BIMETALLIC TEMPERATURE RESPONSIVE MEANS DRIVINGLY CONNECTING SAID ROD MEANS AND SAID CONTACT MEMBER; SAID BIMETALLIC TEMPERATURE RESPONSIVE MEANS COMPENSATING FOR VARIATIONS IN TEMPERATURE BY PROVIDING RELATIVE MOVEMENT BETWEEN SAID ROD MEANS AND SAID CONTACT MEMBER IN RESPONSE TO TEMPERATURE CHANGES; SAID CANTILEVER AND SAID CONTACT MEMER INCLUDING MEANS PROVIDING CONTACT THEREBETWEEN FOR BENDING THE OUTER FREE END OF SAID CANTILEVER IN RESPONSE TO MOVEMENT OF SAID CONTACT MEMBER; RANGE SPRING MEANS DRIVINGLY CONNECTED BETWEEN SAID BODY MEMBER AND SAID ROD MEANS WITHIN SAID CENTRAL CHAMBER.