US2640020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of a surface easily wettable by mercury
Assignee: AT&T Inc
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Filing: 1949-08-09
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Granted: 1953-05-26
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Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles E Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:46
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/06; H01H1/08; C; C25; C25D; C25D7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE METHOD OF FORMING A LIQUID MERCURY CONTACTING SURFACE IN AN ELECTRIC CONTACT, WHEREBY A CONTINUOUSLY REPLENISHABLE SUPPLY OF FRESH LIQUID MERCURY IS MADE AVAILABLE AT THE CONTACTING AREA THROUGH WHICH AN ELECTRIC CURRENT IS TO BE ESTABLISHED AND INTERRUPTED, WHICH METHOD COMPRISES FORMING A CAPILLARY NETWORK IN A FERROUS METAL CONTACT BASE; ELECTROPLATING SAID FORMED BASE WITH A METAL EASILY WETTABLE BY MERCURY AND NOT COMPLETELY SOLUBLE IN MERCURY, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF PLATINUM, RHODIUM AND NICKEL, SAID METAL BEING ELECTROPLATED IN SUCH THICKNESS AS TO LEAVE SAID CAPILLARY NETWORK WELL DEFINED IN THE EXTERIOR ELECTROPLATED SURFACE; HEAT TREATING SAID ELECTROPLATED BASE TO DIFFUSE SOME OF THE ELECTROPLATE INTO THE FERROUS METAL BASE TO PRODUCE A GOOD BOND WHILE LEAVING SAID CAPILLARY NETWORK WELL DEFINED IN SAID EXTERIOR ELECTROPLATED SURFACE; AND IMMERSING SAID ELECTROPLATED AND DIFFUSED CONTACT BASE HAVING SAID WELL DEFINED CAPILLARY NETWORK IN ITS EXTERIOR SURFACE INTO LIQUID MERCURY, TO FILL SAID NETWORK AND TO CONTINUOUSLY REPLENISH SAID CONTACTING AREA WITH LIQUID MERCURY.
Claim 2
Independent Claim
171 words
THE METHOD OF FORMING A LIQUID MERCURY CONTACTING SURFACE IN AN ELECTRIC CONTACT, WHEREBY A CONTINUOUSLY REPLENISHABLE SUPPLY OF FRESH LIQUID MERCURY IS MADE AVAILABLE AT THE CONTACTING AREA THROUGH WHICH AN ELECTRIC CURRENT IS TO BE ESTABLISHED AND INTERRUPTED, WHICH METHOD COMPRISES FORMING A CAPILLARY NETWORK IN A FERROUS METAL CONTACT BASE; ELECTROPLATING SAID FORMED BASE WITH A METAL EASILY WETTABLE BY MERCURY AND NOT COMPLETELY SOLUBLE IN MERCURY, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF PLATINUM, RHODIUM AND NICKEL, SAID METAL BEING ELECTROPLATED IN SUCH THICKNESS AS TO LEAVE SAID CAPILLARY NETWORK WELL DEFINED IN THE EXTERIOR ELECTROPLATED SURFACE; HEAT TREATING SAID ELECTROPLATED BASE TO DIFFUSE SOME OF THE ELECTROPLATE INTO THE FERROUS METAL BASE TO PRODUCE A GOOD BOND WHILE LEAVING SAID CAPILLARY NETWORK WELL DEFINED IN SAID EXTERIOR ELECTROPLATED SURFACE; AND IMMERSING SAID ELECTROPLATED AND DIFFUSED CONTACT BASE HAVING SAID WELL DEFINED CAPILLARY NETWORK IN ITS EXTERIOR SURFACE INTO LIQUID MERCURY, TO FILL SAID NETWORK AND TO CONTINUOUSLY REPLENISH SAID CONTACTING AREA WITH LIQUID MERCURY.
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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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |