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| Number | Title | Issue Date |
| 6781119 | Ion storage system An ion storage system is described that includes an ion trap that defines a volume for storing a plurality of ions. A radio frequency (RF) generator is electromagnetically coupled to the volume defined by the ion trap. The RF generator generates an RF electrical fie... | 08/24/2004 |
| 6776394 | Pendulum valve assembly A valve assembly including a housing having an opening defined by a valve seat, a valve body movable within the housing between a completely opened position disengaged from the valve seat and a completely closed position engaging the valve seat, and a sleeve movable... | 08/17/2004 |
| 6772640 | Multi-temperature heater for use with pressure transducers A heater is disclosed for use with pressure transducers. The disclosed heater includes a first heating element and a second heating element. The first heating element is characterized by a first electrical resistance. The second heating element is characterized by a... | 08/10/2004 |
| 6766260 | Mass flow ratio system and method A system for dividing a single mass flow, including an inlet adapted to receive the single mass flow and at least two flow lines connected to the inlet. Each flow line includes a flow meter and a valve. The system also includes a controller programmed to receive a d... | 07/20/2004 |
| 4571801 | Method of manufacturing a cartridge unit for establishing controlled laminar-flow conditions In a compact thermal flowmeter unit of the type wherein a portion of the fluid in a main flow path is shunted through a laminar-flow sensor passageway, that section of the main flow path which the sensor bypasses is occupied by an appropriate range-govern... | 02/25/1986 |
| 4522058 | Laminar-flow channeling in thermal flowmeters and the like In a compact thermal flowmeter unit of the type wherein a portion of the fluid in a main flow path is shunted through a laminar-flow sensor passageway, that section of the main flow path which the sensor bypasses is occupied by an appropriate range-govern... | 06/11/1985 |
| 4464932 | Thermal mass flowmetering Metering and related control of fluid flow are achieved both accurately and at high response speed by way of a unique sequencing of thermal exchanges with the fluid under closely-regulated and inter-dependent thermal conditions. The flowing fluid is first... | 08/14/1984 |
| 4327894 | Linearized controlled valves Servo control of a butterfly valve or the like, in which fluid flow is inherently non-linearly related to angular orientations of a vane or plug member, is effected through a function-generator mechanism interposed to render the system transfer function s... | 05/04/1982 |
| 4277747 | Wide range digital meter In the ion gauge system disclosed herein, the ion current obtained from an ion gauge tube is directly converted to a signal having a frequency proportional to the ion current so that a digital measurement of vacuum may be obtained. The ion current charges... | 07/07/1981 |
| 4008619 | Vacuum monitoring Monitoring of gas contamination and of related deviations in pressures within a sealed cavity is effected by way of electrical-network responses to conduction characteristics of a thin-film deposit of getter material within the cavity, the getter film bei... | 02/22/1977 |
