Patent US3754674A successfully refreshed from Google Patents.
US3754674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for providing hermetic seals
Assignee: Allis Chalmers Corp
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Filing: 1970-03-03
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Granted: 1973-08-28
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Expires: 1990-03-03
Abstract
Abstract The outwardly flanged end of a glass tube is hermetically sealed by means of a pure or indium coated aluminum wire gasket which is squeezed at a pressure of about 5,000 pounds per linear inch of wire between the glass flange and a metal closure plate and heated to about 482*F or above. The pressure is applied by Cclamps which grip the closure plate and a split ring collar surrounding the tube. An aluminum cushioning gasket is disposed between the collar and the glass flange to prevent glass fracture. Steel spacer shims surround both gaskets to prevent extrusion of the gaskets under pressure.
Inventors
- 👤 H Wesoloski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:17
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/30; H01J2893/00; H01J2893/0033; H01J2893/0045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
In combination; a tubular frangible body having an opening at one end; radial outwardly extending flange means on the exterior of said body adjacent the opening at the one end; a closure member overlying the opening of said body in registering engagement with said flange means; a first aluminum gasket disposed on said flange means and surrounding the opening in said body, said gasket being constructed and arranged to abut the surface of said closure member adjacent to said flange means; a cushioning collar surrounding said body and disposed adjacent to the undersurface of said flange means; a second aluminum gasket disposed between said cushioning collar and said flange means; and, removable pressure exerting means operably connected to apply oppositely acting forces to said closure member and to said cushioning collar; whereby both of said aluminum gaskets are compressed into vacuum tight sealing engagement with the surfaces they engage.
Claim 2
Dependent Claim
149 words
In combination; a tubular frangible body having an opening at one end; radial outwardly extending flange means on the exterior of said body adjacent the opening at the one end; a closure member overlying the opening of said body in registering engagement with said flange means; a first aluminum gasket disposed on said flange means and surrounding the opening in said body, said gasket being constructed and arranged to abut the surface of said closure member adjacent to said flange means; a cushioning collar surrounding said body and disposed adjacent to the undersurface of said flange means; a second aluminum gasket disposed between said cushioning collar and said flange means; and, removable pressure exerting means operably connected to apply oppositely acting forces to said closure member and to said cushioning collar; whereby both of said aluminum gaskets are compressed into vacuum tight sealing engagement with the surfaces they engage.
Claim 3
Dependent Claim
64 words
The combination according to claim 1 wherein there is also provideda first circular shim disposed between said flAnge means and said closure member and surrounding said first aluminum gasket; and, a second circular shim disposed between said cushioning collar and said flange means and surrounding said second aluminum gasket; whereby said shims operate to limit the extrusion of said gaskets to a predetermined amount.
Claim 4
Dependent Claim
29 words
The combination according to claim 1 wherein said cushioning collar is constructed in two sections wih the ends of the sections being formed with mating overslipping and interlocking surfaces.
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |