Patent US2664398A successfully refreshed from Google Patents.
US2664398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing wells
Assignee: Pure Oil Co
•
Filing: 1952-12-02
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Granted: 1953-12-29
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Expires: 1972-12-02
Abstract
No abstract record available.
Inventors
- 👤 Donald C Bond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:56
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
71 words
IN THE RECOVERY OF FLUIDS FROM SUBTERRANEAN RESERVOIRS, THE METHOD OF REDUCING THE RESISTANCE TO THE FLOW OF SAID FLUIDS THROUGH SILICEOUS DEPOSITS ENCOUNTERED IN THE DEVELOPMENT AND EXPLOITATION OF FLUID PRODUCING RESERVOIRS WHICH COMPRISES CONTACTING SAID DEPOSITS WITH AN AQUEOUSOUS SOLUTION OF A FLUOPHOSPHORIC ACID, SAID SOLUTION HAVING A SUFFICIENT CONCENTRATION OF FLUOPHOSPHORIC ACID AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE THE FLUID FLOW RESISTANCE OF SAID FORMATIONS.
Claim 2
Dependent Claim
71 words
IN THE RECOVERY OF FLUIDS FROM SUBTERRANEAN RESERVOIRS, THE METHOD OF REDUCING THE RESISTANCE TO THE FLOW OF SAID FLUIDS THROUGH SILICEOUS DEPOSITS ENCOUNTERED IN THE DEVELOPMENT AND EXPLOITATION OF FLUID PRODUCING RESERVOIRS WHICH COMPRISES CONTACTING SAID DEPOSITS WITH AN AQUEOUSOUS SOLUTION OF A FLUOPHOSPHORIC ACID, SAID SOLUTION HAVING A SUFFICIENT CONCENTRATION OF FLUOPHOSPHORIC ACID AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE THE FLUID FLOW RESISTANCE OF SAID FORMATIONS.
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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) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |