Patent US2843459A successfully refreshed from Google Patents.
US2843459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermochemical logging tool
Assignee: BJ Service Inc
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Filing: 1955-02-07
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Granted: 1958-07-15
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Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Robert F Meiklejohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
G; G01; G01V; G01V9/00; G01V9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
WELL LOGGING APPARATUS COMPRISING: A SUPPORTING STRUCTURE ADAPTED TO BE LOWERED INTO A WELL; AN EXPANSIBLE AND COLLAPSIBLE CHAMBER CARRIED BY SAID STRUCTURE AND CONTAINING REAGENT REACTABLE THERMOCHEMICALLY WITH SELECTED FORMATION FLUIDS; MEANS FORMING AN OUTLET PASSAGE FOR SAID REAGENT FROM SAID CHAMBER TO THE WELL WALL; SPRING MEANS TENDING TO COLLAPSE SAID CHAMBER TO THEREBY FORCE REAGENT THEREFROM THROUGH SAID PASSAGE AND INTO CONTACT WITH THE
Claim 2
Dependent Claim
67 words
WELL LOGGING APPARATUS COMPRISING: A SUPPORTING STRUCTURE ADAPTED TO BE LOWERED INTO A WELL; AN EXPANSIBLE AND COLLAPSIBLE CHAMBER CARRIED BY SAID STRUCTURE AND CONTAINING REAGENT REACTABLE THERMOCHEMICALLY WITH SELECTED FORMATION FLUIDS; MEANS FORMING AN OUTLET PASSAGE FOR SAID REAGENT FROM SAID CHAMBER TO THE WELL WALL; SPRING MEANS TENDING TO COLLAPSE SAID CHAMBER TO THEREBY FORCE REAGENT THEREFROM THROUGH SAID PASSAGE AND INTO CONTACT WITH THE
References Cited (Backward Citations)
US2708155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |