Patent US2690428A successfully refreshed from Google Patents.
US2690428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing wells
Assignee: Pure Oil Co
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Filing: 1951-12-24
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Granted: 1954-09-28
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Expires: 1971-12-24
Abstract
No abstract record available.
Inventors
- 👤 Donald C Bond
- 👤 Roy H Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:15
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN THE ACID TREATMENT OF CALCIUM-CONTAINING SILICEOUS GEOLOGICAL FORMATIONS WITH HYDROFLUORIC ACID-CONTAINING TREATING SOLUTION SELECTED FROM THE GROUP CONSISTING OF HYDROGEN FLUORIDE AND FLUOPHOSPHORIC ACIDS TO INCREASE THE PERMEABILITY OF SAID FORMATION, SAID ACID TREATMENT RESULTING IN THE FORMATION OF FLUOSILICIC ACID, A STEP FOR SUBSTANTIALLY PREVENTING THE PRECIPITATION OF OIL AND WATER INSOLUBLE CALCIUM SALTS DURING SAID ACID TREATMENT, WHICH CONSISTS ESSENTIALLY OF INTRODUCING INTO SAID FORMATIONS ADDED AMOUNTS OF FLUOSILICIC ACID, SAID FLUOSILICIC ACID BEING PRESENT IN AN AMOUNT, SUFFICIENT TO PREVENT SUBSTANTIALLY THE PRECIPITATION OF CALCIUM FLUORIDE.
Claim 2
Dependent Claim
90 words
IN THE ACID TREATMENT OF CALCIUM-CONTAINING SILICEOUS GEOLOGICAL FORMATIONS WITH HYDROFLUORIC ACID-CONTAINING TREATING SOLUTION SELECTED FROM THE GROUP CONSISTING OF HYDROGEN FLUORIDE AND FLUOPHOSPHORIC ACIDS TO INCREASE THE PERMEABILITY OF SAID FORMATION, SAID ACID TREATMENT RESULTING IN THE FORMATION OF FLUOSILICIC ACID, A STEP FOR SUBSTANTIALLY PREVENTING THE PRECIPITATION OF OIL AND WATER INSOLUBLE CALCIUM SALTS DURING SAID ACID TREATMENT, WHICH CONSISTS ESSENTIALLY OF INTRODUCING INTO SAID FORMATIONS ADDED AMOUNTS OF FLUOSILICIC ACID, SAID FLUOSILICIC ACID BEING PRESENT IN AN AMOUNT, SUFFICIENT TO PREVENT SUBSTANTIALLY THE PRECIPITATION OF CALCIUM FLUORIDE.
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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |