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US3147538A
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Method of fabricating mercury-wetted switching devices
Assignee: GTE Sylvania Inc
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Filing: 1961-05-16
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Granted: 1964-09-08
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Expires: 1981-05-16
Abstract
No abstract record available.
Inventors
- 👤 Richard E Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:24
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/06; H01H1/08; H01H11/00; H01H11/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN THE METHOD OF FABRICATING A MERCURY-WETTED, ELECTRICAL SWITCHING DEVICE HOUSED IN A GLASS ENVELOPE, SAID DEVICE HAVING EXPOSED METAL SURFACES, WHEREIN SAID DEVICE HAS AT LEAST ONE ELECTRICAL CONTACT SEALED THROUGH AN END OF SAID ENVELOPE AND WHEREIN ANOTHER ELECTRICAL CONTACT IS AFFIXED TO A METAL EXHAUST TUBE SEALED THROUGH THE OTHER END OF SAID ENVELOPE, THE STEPS WHICH COMPRISE: ADDING MERCURY TO SAID ENVELOPE THROUGH SAID EXHAUST TUBE; EVACUATING GASES PRESENT IN SAID ENVELOPE THROUGH SAID EXHAUST TUBE THEREBY REDUCING THE PRESSURE IN SAID ENVELOPE; IONIZING A PORTION OF SAID MERCURY WHILE CONTINUING THE EVACUATION AND HENCE PRODUCING A VISIBLE GLOW, THEREBY CLEANING AND PRE-WETTING SAID EXPOSED METAL SURFACES IN SAID ENVELOPE; FILLING SAID ENVELOPE WITH A FILL GAS AND SEALING SAID EXHAUST TUBE.
Claim 2
Dependent Claim
126 words
IN THE METHOD OF FABRICATING A MERCURY-WETTED, ELECTRICAL SWITCHING DEVICE HOUSED IN A GLASS ENVELOPE, SAID DEVICE HAVING EXPOSED METAL SURFACES, WHEREIN SAID DEVICE HAS AT LEAST ONE ELECTRICAL CONTACT SEALED THROUGH AN END OF SAID ENVELOPE AND WHEREIN ANOTHER ELECTRICAL CONTACT IS AFFIXED TO A METAL EXHAUST TUBE SEALED THROUGH THE OTHER END OF SAID ENVELOPE, THE STEPS WHICH COMPRISE: ADDING MERCURY TO SAID ENVELOPE THROUGH SAID EXHAUST TUBE; EVACUATING GASES PRESENT IN SAID ENVELOPE THROUGH SAID EXHAUST TUBE THEREBY REDUCING THE PRESSURE IN SAID ENVELOPE; IONIZING A PORTION OF SAID MERCURY WHILE CONTINUING THE EVACUATION AND HENCE PRODUCING A VISIBLE GLOW, THEREBY CLEANING AND PRE-WETTING SAID EXPOSED METAL SURFACES IN SAID ENVELOPE; FILLING SAID ENVELOPE WITH A FILL GAS AND SEALING SAID EXHAUST TUBE.
References Cited (Backward Citations)
US2445406A
Cited
US2459306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |