US3923189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quartz to glass seal
Assignee: RCA Corp
•
Filing: 1973-07-12
•
Granted: 1975-12-02
•
Expires: 1993-07-12
Abstract
Abstract A seal is provided for sealing a quartz envelope to a glass stem in an electron tube. The seal includes an intermediate annular metallic stress relieving ring disposed between the quartz envelope and the glass stem. The annular metallic stress relieving ring has: a radial flange portion, plated with a noble metal and sealed to a silver plated surface of the quartz envelope by a silver chloride cement; a supporting thin narrow relieving portion connected and extending substantially perpendicular to the radial flange portion; and a stem sealing portion which is sealed to the glass stem by conventional sealing techniques and which is interconnected with the annular stress relieving portion.
Inventors
- 👤 Richard Dale Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:36
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/26; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0041; H01J2893/0043; Y; Y10; Y10T; Y10T403/00; Y10T403/21; Y10T403/213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A QUARTZ-TO-GLASS SEAL FOR SEALING AN ANNULAR OPEN END PORTION OF TUBULAR QUARTZ ENVELOPE TO A GLASS STEM IN AN ELECTRON TUBE WHEREIN THE ANNULAR OPEN END OF THE ENVELOPE HAS AN APPROXIMATE OUTSIDE DIAMETER WITHIN THE RANGE OF 0.5 TO 2.0 INCHES; AND WHEREIN THE SEAL INCLUDES AN INTERMEDIATE METALLIC STRESS RELIEVING RING, BETWEEN THE ANNULAR OPEN END PORTION OF THE ENVELOPE AND THE GLASS STEM, OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF: MOLYBDENUM, TUNGSTEN, AND ALLOYS OF COBALT, IRON, AND NICKEL, AND HAVING: A. A FLANGE PORTION WITH A RADICAL SEALING SURFACE PLATED WITH A NOBLE METAL WHICH IS SEALED TO THE ANNULAR OPEN END OF THE QUARTZ ENVELOPE BY A YIELDABLE CEMENT; B. A SUPPORTING THIN NARROW TUBULAR STRESS RELIEVING PORTION HAVING AN APPROXIMATE LONGITUDINAL WIDTH WITHIN THE RANGE OF FROM 0.183 TO 0.25 INCHES, AN APPROXIMATE THICKNESS OF BETWEEN 5 AND 15 MILS; SAID RELIEVING PORTION EXTENDING SUBSTANTIALLY PERPENDICULAR FROM SAID RADICAL FLANGE PORTION AS A TUBULAR EXTENSION OF SAID ENVELOPE, AND C. A STEM SEALING PORTION EXTENDING FROM SAID TUBULAR STRESS RELIEVING PORTION AND SEALED TO SAID GLASS STEM.
Claim 2
Dependent Claim
186 words
A QUARTZ-TO-GLASS SEAL FOR SEALING AN ANNULAR OPEN END PORTION OF TUBULAR QUARTZ ENVELOPE TO A GLASS STEM IN AN ELECTRON TUBE WHEREIN THE ANNULAR OPEN END OF THE ENVELOPE HAS AN APPROXIMATE OUTSIDE DIAMETER WITHIN THE RANGE OF 0.5 TO 2.0 INCHES; AND WHEREIN THE SEAL INCLUDES AN INTERMEDIATE METALLIC STRESS RELIEVING RING, BETWEEN THE ANNULAR OPEN END PORTION OF THE ENVELOPE AND THE GLASS STEM, OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF: MOLYBDENUM, TUNGSTEN, AND ALLOYS OF COBALT, IRON, AND NICKEL, AND HAVING: A. A FLANGE PORTION WITH A RADICAL SEALING SURFACE PLATED WITH A NOBLE METAL WHICH IS SEALED TO THE ANNULAR OPEN END OF THE QUARTZ ENVELOPE BY A YIELDABLE CEMENT; B. A SUPPORTING THIN NARROW TUBULAR STRESS RELIEVING PORTION HAVING AN APPROXIMATE LONGITUDINAL WIDTH WITHIN THE RANGE OF FROM 0.183 TO 0.25 INCHES, AN APPROXIMATE THICKNESS OF BETWEEN 5 AND 15 MILS; SAID RELIEVING PORTION EXTENDING SUBSTANTIALLY PERPENDICULAR FROM SAID RADICAL FLANGE PORTION AS A TUBULAR EXTENSION OF SAID ENVELOPE, AND C. A STEM SEALING PORTION EXTENDING FROM SAID TUBULAR STRESS RELIEVING PORTION AND SEALED TO SAID GLASS STEM.
Claim 3
Dependent Claim
23 words
A quartz-to-glass seal in accordance with claim 1 wherein said sealing surface on said radial flange portion comprises a surface plated with silver.
Claim 4
Dependent Claim
14 words
A quartz-to-glass seal in accordance with claim 2, said yieldable cement comprising silver chloride.
References Cited (Backward Citations)
US2915153A
Cited
US3281174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |