US2955922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detection apparatus
Assignee: White Eagle International Inc
•
Filing: 1957-07-22
•
Granted: 1960-10-11
•
Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Robert F Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:00
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN APPARATUS FOR DETECTING THE PRESENCE OF COMBUSTIBLE GAS IN SPECIMENS RETURNED FROM APPARENTLY SUCCESSIVE INCREMENTS OF DEPTHS OF A WELL BORE, DURING DRILLING OF SAID BORE BY A BIT WHILE A FLUID IS CIRCULATED INTO AND OUT OF THE WALL BORE, INCLUDING MEANS FOR TREATING A SERIES OF POSSIBLE GAS CONTAINING SPECIMENS TO CAUSE GAS TO EVOLVE THEREFROM, A CATALYST FILAMENT CONTACTING SAID GAS TO INDICATE THE PRESENCE OF COMBUSTIBLE GAS THEREIN, MEANS FOR CAUSING SAID GAS TO CONTACT SAID FILAMENT, AN ELECTRICAL WHEATSTONE BRIDGE INCLUDING SAID FILAMENT AND NORMALLY INCLUDING AN ELECTRICAL METER CONNECTED ACROSS SAID CIRCUIT FOR INDICATING AN EFFECT PRODUCED AT SAID FILAMENT BY CATALYTIC COMBUSTION, THE IMPROVEMENT COMPRISING AN
Claim 2
Dependent Claim
114 words
IN APPARATUS FOR DETECTING THE PRESENCE OF COMBUSTIBLE GAS IN SPECIMENS RETURNED FROM APPARENTLY SUCCESSIVE INCREMENTS OF DEPTHS OF A WELL BORE, DURING DRILLING OF SAID BORE BY A BIT WHILE A FLUID IS CIRCULATED INTO AND OUT OF THE WALL BORE, INCLUDING MEANS FOR TREATING A SERIES OF POSSIBLE GAS CONTAINING SPECIMENS TO CAUSE GAS TO EVOLVE THEREFROM, A CATALYST FILAMENT CONTACTING SAID GAS TO INDICATE THE PRESENCE OF COMBUSTIBLE GAS THEREIN, MEANS FOR CAUSING SAID GAS TO CONTACT SAID FILAMENT, AN ELECTRICAL WHEATSTONE BRIDGE INCLUDING SAID FILAMENT AND NORMALLY INCLUDING AN ELECTRICAL METER CONNECTED ACROSS SAID CIRCUIT FOR INDICATING AN EFFECT PRODUCED AT SAID FILAMENT BY CATALYTIC COMBUSTION, THE IMPROVEMENT COMPRISING AN
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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) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |