US3142335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing of wells
Assignee: Halliburton Co
•
Filing: 1960-07-05
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Granted: 1964-07-28
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Expires: 1980-07-05
Abstract
No abstract record available.
Inventors
- 👤 Walter R Dill
- 👤 Francis N Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; C09K8/78; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A SEQUESTERING AGENT FOR IRON AND LIKE SUBSTANCES CONSISTING ESSENTIALLY OF A MEMBER FROM THE GROUP CONSISTING OF CITRIC ACID AND THE SALTS THEREOF AND A MEMBER, OTHER THAN CITRIC ACID AND THE SALTS THEREOF SELECTED FROM THE GROUP CONSISTING OF THE LOW MOLECULAR WEIGHT ORGANIC ACIDS AND THE SALTS THEREOF, THE RELATIVE PROPORTIONS OF SAID MEMBERS BEING SUFFICIENT TO PREVENT PRECIPITATION OF IRON AND LIKE SUBSTANCES, WHEN A GIVEN AMOUNT OF SAID SEQUESTERING AGENT IS ADDED TO A HYDROCHLORIC ACID ACIDIZING FLUID, FOR A LONGER PERIOD OF TIME THAN IS OBTAINED WHEN SUCH GIVEN AMOUNT OF EITHER OF SAID MEMBERS ALONE IS ADDED TO SUCH ACIDIZING FLUID.
Claim 2
Dependent Claim
108 words
A SEQUESTERING AGENT FOR IRON AND LIKE SUBSTANCES CONSISTING ESSENTIALLY OF A MEMBER FROM THE GROUP CONSISTING OF CITRIC ACID AND THE SALTS THEREOF AND A MEMBER, OTHER THAN CITRIC ACID AND THE SALTS THEREOF SELECTED FROM THE GROUP CONSISTING OF THE LOW MOLECULAR WEIGHT ORGANIC ACIDS AND THE SALTS THEREOF, THE RELATIVE PROPORTIONS OF SAID MEMBERS BEING SUFFICIENT TO PREVENT PRECIPITATION OF IRON AND LIKE SUBSTANCES, WHEN A GIVEN AMOUNT OF SAID SEQUESTERING AGENT IS ADDED TO A HYDROCHLORIC ACID ACIDIZING FLUID, FOR A LONGER PERIOD OF TIME THAN IS OBTAINED WHEN SUCH GIVEN AMOUNT OF EITHER OF SAID MEMBERS ALONE IS ADDED TO SUCH ACIDIZING FLUID.
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |