Patent DE633904C successfully refreshed from Google Patents.
Patent US3655963A successfully refreshed from Google Patents.
US3655963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the slit width of adjustable slit electrodes in mass spectrometers
Assignee: Finnigan MAT GmbH
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Filing: 1969-12-01
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Granted: 1972-04-11
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Expires: 1989-12-01
Abstract
Abstract The slit width defined by a pair of slit electrodes in a mass spectrometer is controlled by means of a pair of hot wires, one being coupled to each slit electrode. Each wire extends about two spaced supporting elements and a tensile bar is used to couple a midpoint of each hot wire to its respective electrode. A temperature control arrangement is also used and includes a heating wire coupled to all supporting elements to maintain the temperature of the supporting elements constant as the current in the hot wires is changed to vary the slit width. This type of operation is provided by connecting both the hot wires and heating wire to an electrical regulating device that maintains the sum of the currents in these wires at a constant value.
Inventors
- 👤 Kurt Brunnee
- 👤 Feodor Otto Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:45
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/06; H01J49/067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In a device for controlling the slit width of mass spectrometer adjustable slit electrodes having: resilient means coupled to at least one of the slit electrodes for biasing the slit electrode in one direction; a heat conductive control wire; spaced supporting means for fixedly supporting the control wire at at least two points; means intercoupling the control wire and slit electrode; and adjustable heating means coupled to the control wire for supplying control current to the wire to thereby cause the slit width to vary; the improvement comprising; a temperature stabilizing wire capable of carrying compensating current coupled from the adjustable heating means to thE spaced supporting means for maintaining the spaced supporting means at a relatively constant temperature.
Claim 2
Dependent Claim
119 words
In a device for controlling the slit width of mass spectrometer adjustable slit electrodes having: resilient means coupled to at least one of the slit electrodes for biasing the slit electrode in one direction; a heat conductive control wire; spaced supporting means for fixedly supporting the control wire at at least two points; means intercoupling the control wire and slit electrode; and adjustable heating means coupled to the control wire for supplying control current to the wire to thereby cause the slit width to vary; the improvement comprising; a temperature stabilizing wire capable of carrying compensating current coupled from the adjustable heating means to thE spaced supporting means for maintaining the spaced supporting means at a relatively constant temperature.
Claim 3
Dependent Claim
52 words
A device as defined in claim 1 wherein the adjustable heating means provides current for both the control wire and the temperature stabilizing wire, the current in the temperature stabilizing wire compensating for the variation of heating of the spaced supporting means caused by the control current flowing through the control wire.
Claim 4
Dependent Claim
53 words
A device as defined in claim 2 wherein the control wire and the temperature stabilizing wire are connected to the supporting means adjacent to one another, and wherein both wires are connected to the adjustable heating means which maintains the sum of the control current and the compensating current at a constant value.
Claim 5
Dependent Claim
31 words
A device as defined in claim 1 including parallel leaf springs for supporting the slit electrode and which are arranged transversely to the direction of adjusting movement of the slit electrode.
Claim 6
Independent Claim
116 words
A device for controlling the slit width of mass spectrometer adjustable slit electrodes comprising: resilient means coupled to at least one of the slit electrodes for biasing the slit electrode in one direction; a heat conductive wire coupled to said slit electrode; spaced supporting means for fixedly supporting the control wire at at least two points; adjustable heating means coupled to the control wire for supplying control current to the wire to thereby cause the slit width to vary; and a temperature stabilizing means operable for maintaining the spaced supporting means at a relatively constant temperature, said temperature stabilizing means including means connected to said spaced supporting means for transferring heat to said spaced supporting means.
Claim 7
Independent Claim
116 words
A device for controlling the slit width of mass spectrometer adjustable slit electrodes comprising: resilient means coupled to at least one of the slit electrodes for biasing the slit electrode in one direction; a heat conductive wire coupled to said slit electrode; spaced supporting means for fixedly supporting the control wire at at least two points; adjustable heating means coupled to the control wire for supplying control current to the wire to thereby cause the slit width to vary; and a temperature stabilizing means operable for maintaining the spaced supporting means at a relatively constant temperature, said temperature stabilizing means including means connected to said spaced supporting means for transferring heat to said spaced supporting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |