Patent US3567928A successfully refreshed from Google Patents.
US3567928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent analytical radiation source for producing soft x-rays and secondary electrons
Assignee: EIDP Inc
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Filing: 1969-06-12
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Granted: 1971-03-02
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Expires: 1989-06-12
Abstract
Abstract A fluorescent analytical radiation source concurrently producing fluorescent soft X-ray and secondary electron emissions with high efficiency provided with means for selective energy cut off of the secondary electrons in order to isolate secondary electron emission characteristic of specific elements under analysis.
Inventors
- 👤 Robert D Davies
- 👤 Heribert K Herglotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/22; G01N23/223; G01N23/2209; H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; G01N2223/00; G01N2223/07; G01N2223/072; G01N2223/076; G01N2223/084; G01N2223/20; G01N2223/204
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A fluorescent analytical radiation source for simulTaneously producing fluorescent soft X-ray and secondary electron emissions characteristic of a sample in analysis according to claim 1 wherein said X-ray anode plate is formed with a concave rotationally symmetrical electron impingement target surface of frustoconical configuration.
Claim 2
Dependent Claim
37 words
A fluorescent analytical radiation source for simultaneously producing fluorescent soft X-ray and secondary electron emissions characteristic of a sample in analysis according to claim 1 where said high emission area cathode filament is a helically wound element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |