US4757229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel electron multiplier
Assignee: K & M ELECTRONICS Inc A CORP OF MASSACHUSETTS
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Filing: 1986-11-19
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Granted: 1988-07-12
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Expires: 2006-11-19
Abstract
Abstract A channel electron multiplier having a semiconductive secondary emissive coating on the walls of said channel wherein said electron multiplier is a monolithic ceramic body and said channel therein preferably is three dimensional.
Inventors
- 👤 Kenneth C. Schmidt
- 👤 James L. Knak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:00
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
An electron multiplier device comprising: a monolithic electrically insulating body, at least one entrance port in said body and at least one exit port in said body, at least one hollow curved passageway through said body between said entrance and exit ports, and the walls of said hollow passageways including secondary-emissive dynode material.
Claim 2
Dependent Claim
53 words
An electron multiplier device comprising: a monolithic electrically insulating body, at least one entrance port in said body and at least one exit port in said body, at least one hollow curved passageway through said body between said entrance and exit ports, and the walls of said hollow passageways including secondary-emissive dynode material.
Claim 3
Dependent Claim
16 words
The electron multiplier device of claim 1 wherein: said body is formed from a ceramic material.
Claim 4
Dependent Claim
17 words
The electron multiplier device of claim 2 wherein: said hollow passageway has at least one turn therein.
Claim 5
Dependent Claim
18 words
The electron multiplier device of claim 2 wherein: said passageway forms a two dimensional curve in said body.
Claim 6
Dependent Claim
18 words
The electron multiplier device of claim 3 wherein: said passageway forms a three dimensional curve in said body.
Claim 7
Dependent Claim
17 words
The electron multiplier device of claim 5 wherein: said three dimensional curve is a helix or spiral.
Claim 8
Dependent Claim
16 words
The electron multiplier device of claim 2 wherein: the entrance port is a funnel shaped portion.
Claim 9
Dependent Claim
19 words
The electron multiplier device of claim 2 wherein: said dynode material is a glass having an electrically conductive surface.
Claim 10
Dependent Claim
12 words
The electron multiplier device of claim 1 wherein: said passageway is seamless.
References Cited (Backward Citations)
US3128408A
Cited
US3224922A
Cited
US4095132A
Cited
US3612946A
Cited
US3790840A
Cited
CA1121858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |