US2861921A
Expired / Lapsed
US
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Microbiological petroleum prospecting method
Assignee: ExxonMobil Oil Corp
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Filing: 1954-01-25
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Granted: 1958-11-25
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 David M Updegraff
- 👤 Hubert H Chase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:12
CPC Classifications
C; C12; C12M; C12M41/00; C12M41/30; C12M41/36; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A MICROBIOLOGICAL METHOD OF PROSPECTING FOR A SUBTERRANEAN PETROLEUM DEPOSIT COMPRISING COLLECTING EARTH SAMPLES AT SPACED LOCATIONS OVER A PROSPECT AREA, ADMIXING A KNOWN PORTION OF EACH OF SAID SAMPLES WITH AQUEOUS INORGANIC SALT MEDIUM FOR BACTERIA, CONTACTING THE RESULTING MIXTURE WITH A NUTRIENT COMPRISING A PETROLEUM HYDROCARBON, AND DETERMINING THE TIME REQUIRED FOR CONSUMPTION OF SAID NUTRIENT BY BACTERIA IN EACH OF
Claim 2
Dependent Claim
63 words
A MICROBIOLOGICAL METHOD OF PROSPECTING FOR A SUBTERRANEAN PETROLEUM DEPOSIT COMPRISING COLLECTING EARTH SAMPLES AT SPACED LOCATIONS OVER A PROSPECT AREA, ADMIXING A KNOWN PORTION OF EACH OF SAID SAMPLES WITH AQUEOUS INORGANIC SALT MEDIUM FOR BACTERIA, CONTACTING THE RESULTING MIXTURE WITH A NUTRIENT COMPRISING A PETROLEUM HYDROCARBON, AND DETERMINING THE TIME REQUIRED FOR CONSUMPTION OF SAID NUTRIENT BY BACTERIA IN EACH OF
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |