US3439261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustible gas detector using a corona discharge
Assignee: General Electric Co
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Filing: 1966-09-30
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Granted: 1969-04-15
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Expires: 1986-09-30
Abstract
No abstract record available.
Inventors
- 👤 Jack C Loh
- 👤 Robert S Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/68; G01N27/70
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
155 words
A HYDROCARBON GAS DETECTOR COMPRISING: (A) SUPPORT MEANS; (B) A CATHODE MOUNTED ON SAID SUPPORT MEANS INCLUDING AN OXIDE COATING OF A METAL TAKEN FROM THE GROUP CONSISTING OF TITANIUM AND TUNGSTEN; (C) A NOBLE METAL ANODE MOUNTED ON SAID SUPPORT MEANS HAVING A SMOOTH SURFACE TIP FORMED THEREON, THE SURFACE OF SAID TIP BEING SPACED FROM SAID CATHODE BY A DISTANCE FROM 0.3 MIL TO 0.7 MIL TO DEFINE A CORONA DISCHARGE GAP; (D) MEANS FOR HEATING SAID CATHODE; AND (E) POWER SUPPLY MEANS CONNECTED FOR ENERGIZING SAIDANODE AND SAID CATHODE TO IMPRESS A POTENTIAL ACROSS SAID GAP WHICH IS GREATER THAN THE CORONA START VOLTAGE OF THE HYDROCARBON GAS TO BE DETECTED AND LESS THAN THE SPARKING POTENTIAL OF SAID GAP, SAID POWER SUPPLY MEANS INCLUDING INDICATING MEANS RESPONSIVE TO INCREASED CURRENT FLOW ACROSS SAID GAP WHEN THE HYDROCARBON GAS IS PASSED THROUGH SAID GAP TO INDICATE THE PRESENCE OF THE HYDROCARBON GAS.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |