Patent US2742425A successfully refreshed from Google Patents.
US2742425A
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Acidizing siliceous formations
Assignee: Pure Oil Co
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Filing: 1954-01-26
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Granted: 1956-04-17
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Expires: 1974-01-26
Abstract
No abstract record available.
Inventors
- 👤 Orrin C Holbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:36
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A PROCESS FOR ACID TREATING SILICEOUS GEOLOGICAL FORMATIONS CONTAINING FERROUS CONSTITUENTS TO MITIGATE THE FORMATION OF INSOLUBLE FERROUS PRECIPITATES WHICH TEND TO CLOG THE INTERSTITIAL PASSAGES OF SAID FORMATION, THE STEP WHICH COMPRISES CONTACTING SAID FORMATION WITH AN AQUEOUS SOLUTION OF HEXAFLUOPHOSPHORIC ACID AND HYDROGEN CHLORIDE, SAID HEXAFLUOPHOSPHORIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE THE RESISTANCE OF SAID FORMATION OF FLUID FLOW THERETHROUGH, AND SAID HYDROGEN CHLORIDE BEING PRESENT IN AN AMOUNT SUFFICIENT TO MITIGATE THE FORMATION OF SAID FERROUS PRECIPITATES.
Claim 2
Dependent Claim
85 words
IN A PROCESS FOR ACID TREATING SILICEOUS GEOLOGICAL FORMATIONS CONTAINING FERROUS CONSTITUENTS TO MITIGATE THE FORMATION OF INSOLUBLE FERROUS PRECIPITATES WHICH TEND TO CLOG THE INTERSTITIAL PASSAGES OF SAID FORMATION, THE STEP WHICH COMPRISES CONTACTING SAID FORMATION WITH AN AQUEOUS SOLUTION OF HEXAFLUOPHOSPHORIC ACID AND HYDROGEN CHLORIDE, SAID HEXAFLUOPHOSPHORIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE THE RESISTANCE OF SAID FORMATION OF FLUID FLOW THERETHROUGH, AND SAID HYDROGEN CHLORIDE BEING PRESENT IN AN AMOUNT SUFFICIENT TO MITIGATE THE FORMATION OF SAID FERROUS PRECIPITATES.
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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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |