US4021216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making strip microchannel electron multiplier array
Assignee: International Telephone and Telegraph Corp
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Filing: 1975-10-24
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Granted: 1977-05-03
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Expires: 1995-10-24
Abstract
Abstract A linear array of electron multiplier microchannels is formed by fusing a plurality of solid core glass fibers into a rectangular array. A number of arrays is then sandwiched between a pair of glass plate support members fused into a linear arrangement followed by treating to form the electron multiplier. Treatment comprises subjecting the arrangement to an acid etch for removing the core material and hydrogen firing to activate the core walls for secondary electron emission. The apparatus finds application as an ion-electron converter in focal plane mass spectrometers where high electron gain is required.
Inventors
- 👤 Adolf R. Asam
- 👤 John T. Balkwill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:00
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J43/246; C; C03; C03B; C03B23/00; C03B23/20; C03B23/207; C03B37/00; C03B37/10; C03B37/14; C03B37/15; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J2201/00; H01J2201/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A method of forming a strip microchannel electron multiplier comprising the steps of: providing a plurality of solid cladded glass fibers of uniform cross-section containing a core glass of etchable material and a cladding glass of nonetchable material; heating said plurality of fibers in close proximity with each other to cause the fibers to adhere and form a block-like configuration; heating a plurality of said fiber blocks in close proximity to each other to cause the blocks to adhere and form a linear array; fusing a first strip of glass on one side of the linear array; fusing a second strip of glass on the other side of the array to provide support to the array; and heating the array at an annealing temperature to anneal the array.
Claim 2
Independent Claim
128 words
A method of forming a strip microchannel electron multiplier comprising the steps of: providing a plurality of solid cladded glass fibers of uniform cross-section containing a core glass of etchable material and a cladding glass of nonetchable material; heating said plurality of fibers in close proximity with each other to cause the fibers to adhere and form a block-like configuration; heating a plurality of said fiber blocks in close proximity to each other to cause the blocks to adhere and form a linear array; fusing a first strip of glass on one side of the linear array; fusing a second strip of glass on the other side of the array to provide support to the array; and heating the array at an annealing temperature to anneal the array.
Claim 3
Dependent Claim
21 words
The method of claim 1 including the step of inserting a glass support fiber at each end of said linear array.
Claim 4
Independent Claim
16 words
The method of 1 including the step of slicing said array into a plurality of subarrays.
Claim 5
Independent Claim
16 words
The method of 1 including the step of slicing said array into a plurality of subarrays.
Claim 6
Dependent Claim
16 words
The method of claim 3 wherein said array is sliced along the direction of greatest length.
Claim 7
Dependent Claim
36 words
The method of claim 1 wherein said linear array comprises a plurality of said fiber blocks fused to form a continuous rectangle wherein the length of said rectangle is greater than the width of said rectangle.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said core glass is selected from the group of glasses consisting of lanthanum and potassium.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein said cladding glass is selected from the group of glasses consisting of sodium and lead.
Claim 10
Dependent Claim
49 words
The method of claim 7 including the step of etching said subarrays to remove said core glass material and provide a plurality of hollow passages through said subarrays wherein said hollow passages are supported by said cladding glass and said hollow passages provide entrance and exit paths for electrons.
Claim 11
Dependent Claim
24 words
The method of claim 8 including the step of subjecting said subarrays to substances capable of at least partially chemically reducing said cladding glass.
Claim 12
Dependent Claim
31 words
The method of claim 9 including the steps of metallizing a portion of said cladding glass proximate said electron entrance and exit paths for subjecting said electrons to an electric field.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |