Patent US3999698A successfully refreshed from Google Patents.
US3999698A
Expired / Lapsed
US
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Method of sealing a pyroelectric target in a vacuum tight envelope
Assignee: Philips North America LLC
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Filing: 1975-08-29
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Granted: 1976-12-28
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Expires: 1995-08-29
Abstract
Abstract A pyroelectric target for a vidicon is effectively sealed in a vacuum-tight envelope by resiliently mounting in a retainer ring bonded by indium to a window transparent to visible and infra-red radiation. The window is then sealed in one end of an envelope which is evacuated.
Inventors
- 👤 Thomas H. Conklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:11
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A method of sealing a pyroelectric target in a hermetically sealed envelope comprising the steps of placing a plurality of soft metal bodies at spaced points on a window transparent to visible and infra-red radiation, placing an annular retainer member over the metal bodies, applying pressure sufficient to cause the metal to flow, placing the pyroelectric target within the annular retainer member, resiliently securing said pyroelectric target member within said retainer member, and thereafter sealing said window in one end of an envelope which is subsequently evacuated.
Claim 2
Independent Claim
87 words
A method of sealing a pyroelectric target in a hermetically sealed envelope comprising the steps of placing a plurality of soft metal bodies at spaced points on a window transparent to visible and infra-red radiation, placing an annular retainer member over the metal bodies, applying pressure sufficient to cause the metal to flow, placing the pyroelectric target within the annular retainer member, resiliently securing said pyroelectric target member within said retainer member, and thereafter sealing said window in one end of an envelope which is subsequently evacuated.
Claim 3
Dependent Claim
13 words
A method as claimed in claim 1 wherein the metal bodies are indium.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 2 wherein the pyroelectric target is tri-glycine sulfate.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |