US3576066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making vacuum components
Assignee: TDK Micronas GmbH
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Filing: 1969-06-27
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Granted: 1971-04-27
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Expires: 1989-06-27
Abstract
Abstract A method of making evacuated enclosures such as envelopes for vacuum switches, relays, or interrupters. The method may include a step of brazing the envelope to provide an hermetic seal in a reducing atmosphere at atmospheric pressure. The envelope is then reheated in a vacuum chamber. At least one portion of the envelope is made of a material through which the reducing gas can pass.
Inventors
- 👤 Lewis B Steward
- 👤 Wesley N Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:53
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/666; H01H33/6664; H01H50/00; H01H50/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
The method of making an evacuated enclosure, said method comprising the steps of: hermetically sealing an envelope with a gas inside thereof, said envelope having at least one portion through which said gas will diffuse; and reducing the pressure of gas around the outside of said envelope at least at said portion to a pressure sufficiently below that inside said envelope to cause said gas inside said envelope to diffuse through said envelope portion.
Claim 2
Independent Claim
74 words
The method of making an evacuated enclosure, said method comprising the steps of: hermetically sealing an envelope with a gas inside thereof, said envelope having at least one portion through which said gas will diffuse; and reducing the pressure of gas around the outside of said envelope at least at said portion to a pressure sufficiently below that inside said envelope to cause said gas inside said envelope to diffuse through said envelope portion.
Claim 3
Dependent Claim
100 words
The invention as defined in claim 1, wherein said envelope includes at least two component parts, said sealing step including brazing said parts together in an atmosphere of hydrogen gas at a brazing temperature, the gas left inside said envelope thereby being hydrogen, said brazing step being performed in a hydrogen oven with a dewpoint of less than -70* F., placing said envelope in a vacuum oven, increasing said vacuum oven temperature to about 700* C. for about 45 minutes, reducing the pressure in said vacuum oven to between about 10 6 to 10 8 Torr during said 45 minutes.
Claim 4
Dependent Claim
15 words
The invention as defined in claim 2, wherein said envelope portion is made of nickel.
Claim 5
Dependent Claim
24 words
The invention as defined in claim 2, wherein said envelope portion is made of two uniformly mixed metals, said metals being nickel and iron.
Claim 6
Dependent Claim
52 words
The invention as defIned in claim 1, wherein said envelope is hermetically sealed at atmospheric pressure in a reducing atmosphere at a temperature above room temperature, said method including the step of heating said sealed envelope and the gas therein at the same time the pressure of the gas therearound is reduced.
Claim 7
Dependent Claim
17 words
The invention as defined in claim 1, wherein said envelope is hermetically sealed in a reducing atmosphere.
Claim 8
Dependent Claim
15 words
The invention as defined in claim 1, wherein said envelope is sealed at atmospheric pressure.
Claim 9
Dependent Claim
19 words
The invention as defined in claim 1, wherein said sealing step is performed at a temperature above room temperature.
Claim 10
Dependent Claim
34 words
The invention as defined in claim 1, wherein said method includes the step of heating said sealed envelope and the gas therein at the same time the pressure of the gas therearound is reduced.
References Cited (Backward Citations)
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |