US3838280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier and quadrupole mass spectrometer utilizing same
Assignee: Individual
•
Filing: 1973-02-16
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Granted: 1974-09-24
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Expires: 1993-02-16
Abstract
Abstract The negative ion output of a quadrupole mass spectrometer utilizes an amplifier system including an electron multiplier a differential amplifier, an operational amplifier, an emitter follower, and a photoisolator connected to receive the output of the emitter follower.
Inventors
- 👤 J Yinon
- 👤 F Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:13
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/22; H; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
An amplifier and quadrople mass spectrometer combination comprising: a quadropole mass spectrometer; an electron multiplier connected to receive the output of said spectrometer, the electron multiplier having a high voltage anode; an amplifier system connected to receive the output of said high voltage anode comprising an amplifier circuit receiving the input signal; an emitter follower circuit connected to receive the output of said amplifier circuit; and a photo-isolator connected to receive the output of said emitter follower circuit; said emitter follower circuit matching the impedance between the amplifier circuit and the photo isolator; and output means connected to receive the output of said amplifier system.
Claim 2
Dependent Claim
105 words
An amplifier and quadrople mass spectrometer combination comprising: a quadropole mass spectrometer; an electron multiplier connected to receive the output of said spectrometer, the electron multiplier having a high voltage anode; an amplifier system connected to receive the output of said high voltage anode comprising an amplifier circuit receiving the input signal; an emitter follower circuit connected to receive the output of said amplifier circuit; and a photo-isolator connected to receive the output of said emitter follower circuit; said emitter follower circuit matching the impedance between the amplifier circuit and the photo isolator; and output means connected to receive the output of said amplifier system.
Claim 3
Dependent Claim
23 words
The amplifier and quadropole mass spectrometer combination according to claim 1, wherein said amplifier circuit comprises a differential amplifier and an operational amplifier.
Claim 4
Dependent Claim
36 words
The amplifier and quadropole mass spectrometer combination according to claim 2, wherein said differential amplifier includes metal-oxide semiconductor field-effect transistOrs receiving electrical signals at high input resistance and having an output matched to the operational amplifier.
References Cited (Backward Citations)
US3641340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |