Patent US3597838A successfully refreshed from Google Patents.
US3597838A
Expired / Lapsed
US
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Method of making a hermetically sealed circuit breaker
Assignee: GTE Sylvania Inc
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Filing: 1968-10-01
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Granted: 1971-08-10
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Expires: 1988-10-01
Abstract
Abstract A thermostatic, metallic, snap-acting element and a substantially rigid, electrically conductive post are inserted into an open-ended glass envelope and are then sealed to one end thereof, the element and post being in normal electrical contact. The assembly is then heated to a predetermined temperature and, if the element snaps open, the post is physically displaced to prevent opening thereof at that temperature. The process is repeated at a higher predetermined temperature to ensure opening at the higher temperature. The envelope is then tubulated, filled and sealed.
Inventors
- 👤 Philip Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:50
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/64; H01H37/68; H01H11/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208; Y10T29/4921; Y10T29/49211
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
In the process of manufacturing a glass enclosed hermetically sealed thermostatic circuit breaker, the steps which comprise: inserting a thermostatic circuit breaker assembly including leadin wires, a snappable contact and a stationary contact, said contacts being normally closed, into an open-ended glass envelope; hermetically sealing by glass to metal seal the lead-in wires of said assembly in one end of said envelope; heating said envelope and assembly, one end of said envelope being open, by immersing in a heated liquid bath to determine whether said contacts open within a predetermined temperature range; varying the contact pressure between said contacts, if said contacts fail to open within said predetermined temperatures range, by physical displacement thereof by means of an elongated tool inserted and removed through said open end of said envelope; and sealing the open end of said envelope.
Claim 2
Dependent Claim
138 words
In the process of manufacturing a glass enclosed hermetically sealed thermostatic circuit breaker, the steps which comprise: inserting a thermostatic circuit breaker assembly including leadin wires, a snappable contact and a stationary contact, said contacts being normally closed, into an open-ended glass envelope; hermetically sealing by glass to metal seal the lead-in wires of said assembly in one end of said envelope; heating said envelope and assembly, one end of said envelope being open, by immersing in a heated liquid bath to determine whether said contacts open within a predetermined temperature range; varying the contact pressure between said contacts, if said contacts fail to open within said predetermined temperatures range, by physical displacement thereof by means of an elongated tool inserted and removed through said open end of said envelope; and sealing the open end of said envelope.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein said contact pressure is varied by moving said stationary contact toward said snappable contact if said contacts fail to open at the upper limit of said predetermined temperature range.
Claim 4
Dependent Claim
34 words
The process of claim 1 wherein said contact pressure is varied by moving said stationary contact away from said snappable contact if said contacts open at the lower limit of said predetermined temperature range.
Claim 5
Dependent Claim
40 words
The process of claims 1, 2 or 3 including the step of tubulating the open end of said envelope, after determination that said contacts open within said predetermined temperature range but prior to sealing the open end of said envelope.
Claim 6
Dependent Claim
52 words
The process of claim 1 including the steps of tubulating the open end of said envelope, after determination that said contacts open within said predetermined temperature range but prior to sealing the open end of said envelope and exhausting and filling said enveLope by means of said tubulation and sealing said tubulation.
Claim 7
Dependent Claim
52 words
The process of claim 2 including the steps of tubulating the open end of said envelope, after determination that said contacts open within said predetermined temperature range but prior to sealing the open end of said envelope and exhausting and filling said envelope by means of said tabulation and sealing said tubulation.
Claim 8
Dependent Claim
52 words
The process of claim 3 including the steps of tubulating the open end of said envelope, after determination that said contacts open within said predetermined temperature range but prior to sealing the open end of said envelope and exhausting and filling said envelope by means of said tubulation and sealing said tubulation.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |