Patent US4842894A successfully refreshed from Google Patents.
US4842894A
Expired / Lapsed
US
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Method of vapor depositing a luminescent layer on the screen of an x-ray image intensifier tube
Assignee: US Philips Corp
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Filing: 1986-09-12
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Granted: 1989-06-27
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Expires: 2006-09-12
Abstract
Abstract Vapor deposition crucible is provided at least twenty degrees from the central normal to a smooth surface of a screen on which luminescent material is to be deposited. During deposition the surface is rotated relative to the source to produce a layer having a regular structure and a good fill factor.
Inventors
- 👤 Martinus A. C. Ligtenberg
- 👤 August L. H. Simons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:16
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; G; G21; G21K; G21K4/00; H01J9/02; H01J9/12; H01J9/221
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A method of manufacturing an X-ray image intensifier tube comprising a support having a smooth surface having a layer of luminescent material thereon, said method comprising the following steps: providing a vapor deposition source of luminescent material facing said smooth surface at an angle above approximately thirty degrees from the central normal to said surface, rotating said support with respect to said source about said central normal to the center of the surface, vapor depositing said luminescent layer on said surface.
Claim 2
Independent Claim
81 words
A method of manufacturing an X-ray image intensifier tube comprising a support having a smooth surface having a layer of luminescent material thereon, said method comprising the following steps: providing a vapor deposition source of luminescent material facing said smooth surface at an angle above approximately thirty degrees from the central normal to said surface, rotating said support with respect to said source about said central normal to the center of the surface, vapor depositing said luminescent layer on said surface.
Claim 3
Dependent Claim
24 words
A method as in claim 1 wherein said vapor deposition source is at an angle between forty and fifty degrees from said central normal.
Claim 4
Dependent Claim
21 words
A method as in claim 1 wherein said support performs at least twenty revolutions about said central normal to said surface.
Claim 5
Dependent Claim
18 words
A method as in claim 1 wherein said vapor deposition source performs a circular movement about said normal.
Claim 6
Dependent Claim
19 words
A method as in claim 4 wherein said vapor deposition source performs at least twenty revolutions about said normal.
Claim 7
Dependent Claim
13 words
A method as in claim 1 wherein said support is a sphere segment.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |