Patent US1664303A successfully refreshed from Google Patents.
Patent US3914634A successfully refreshed from Google Patents.
US3914634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel plate acting as discrete secondary-emissive dynodes
Assignee: US Philips Corp
•
Filing: 1972-12-21
•
Granted: 1975-10-21
•
Expires: 1992-12-21
Abstract
Abstract Perforate metal layers having aligned apertures defining channels are closely spaced from each other by uniformly distributed arrays of separator elements which accurately maintain relative spacing under varying temperature conditions even though the separator elements and metal layers have different coefficients of thermal expansion.
Inventors
- 👤 Colin Douglas Overall
- 👤 Derek Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:47
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A channel plate comprising a laminated structure of perforate electrically conducting metal layers having aligned apertures defining channels, said metal layers being spaced from each other by a distance less than the thickness of said metal layers by uniformly distributed arrays of mutually spaced individual separator elements that do not surround or block individual apertures of said metal layers, the material of said separator elements being substantially less conductive than said metal layers, thereby allowing said metal layers to be maintained at successively higher electrical potentials in order to act as discrete secondary-emissive dynodes, said uniformly distributed arrays of mutually spaced individual separator elements accurately maintaining said metal layers in a parallel relationship even though the coefficients of thermal expansion of the material of said separator elements and said metal be different and a temperature change occurs.
Claim 2
Dependent Claim
137 words
A channel plate comprising a laminated structure of perforate electrically conducting metal layers having aligned apertures defining channels, said metal layers being spaced from each other by a distance less than the thickness of said metal layers by uniformly distributed arrays of mutually spaced individual separator elements that do not surround or block individual apertures of said metal layers, the material of said separator elements being substantially less conductive than said metal layers, thereby allowing said metal layers to be maintained at successively higher electrical potentials in order to act as discrete secondary-emissive dynodes, said uniformly distributed arrays of mutually spaced individual separator elements accurately maintaining said metal layers in a parallel relationship even though the coefficients of thermal expansion of the material of said separator elements and said metal be different and a temperature change occurs.
Claim 3
Dependent Claim
51 words
A channel plate as defined in claim 1, wherein said apertures are tapered, each aperture having a cross-sectional area which reduces in the same direction, thereby tending to prevent electrons from entering the space between metal layers when said metal layers are maintained at successively higher potentials in said same direction.
Claim 4
Dependent Claim
34 words
A channel plate as defined in claim 2, wherein said alignment of said apertures is staggered, thereby resulting in channels which are either not straight or are not everywhere normal to said metal layers.
Claim 5
Dependent Claim
20 words
A channel plate as defined in claim 1, wherein said separator elements are in the form of strips of material.
Claim 6
Dependent Claim
21 words
A channel plate as defined in claim 1, wherein said separator elements are in the form of individual islands of material.
Claim 7
Dependent Claim
18 words
A channel plate as defined in claim 1, wherein the material of said separator elements is insulating material.
Claim 8
Dependent Claim
18 words
A channel plate as defined in claim 1, wherein the material of said separator elements is resistive material.
Claim 9
Dependent Claim
18 words
A channel plate as defined in claim 1, wherein the material of said metal layers is mild steel.
Claim 10
Dependent Claim
17 words
A channel plate as defined in claim 8, wherein the material of said separator elements is glass.
Claim 11
Dependent Claim
17 words
A channel plate as defined in claim 1, wherein the material of said metal layers is aluminum.
Claim 12
Dependent Claim
18 words
A channel plate as defined in claim 10, wherein the material of said separator elements is aluminum oxide.
Claim 13
Dependent Claim
34 words
A channel plate as defined in claim 1, wherein said alignment of said apertures is staggered, thereby resulting in channels which are either not straight or are not everywhere normal to said metal layers.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |