US2713033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing oil-bearing formations
Assignee: Dow Chemical Co
•
Filing: 1952-09-15
•
Granted: 1955-07-12
•
Expires: 1972-09-15
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Jr Albert W Coulter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:41
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF TREATING A WELL DRILLED INTO A PETROLEUM-BEARING FORMATION WHICH COMPRISES INTRODUCING INTO THE WELL AND THENCE INTO THE FORMATION A HYDROCHLORIC ACID SOLUTION CONTAINING FROM 1 TO 25 PER CENT OF HC1 AND FROM 0.001 TO 10 PER CENT OF A TETRAAKLYL AMMONIUM HALIDE WHEREIN TWO OF THE ALKYL RADICALS ARE METHYL RADICALS AND TWO OF THE ALKYL RADICALS CONTAIN FROM 12 TO 14 CARBON ATOMS.
Claim 2
Independent Claim
69 words
THE METHOD OF TREATING A WELL DRILLED INTO A PETROLEUM-BEARING FORMATION WHICH COMPRISES INTRODUCING INTO THE WELL AND THENCE INTO THE FORMATION A HYDROCHLORIC ACID SOLUTION CONTAINING FROM 1 TO 25 PER CENT OF HC1 AND FROM 0.001 TO 10 PER CENT OF A TETRAAKLYL AMMONIUM HALIDE WHEREIN TWO OF THE ALKYL RADICALS ARE METHYL RADICALS AND TWO OF THE ALKYL RADICALS CONTAIN FROM 12 TO 14 CARBON ATOMS.
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) | 1958-07-11 | 1959-01-10 | 1959-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-11 | 1963-01-10 | 1963-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-11 | 1967-01-10 | 1967-07-12 | $7700.00 | Window Closed / Lapsed |