Patent US2723221A successfully refreshed from Google Patents.
US2723221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of chelating agents to improve acid treatment of hydrocarbon streams
Assignee: Phillips Petroleum Co
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Filing: 1954-12-06
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Granted: 1955-11-08
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Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 Christopher P Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:37
CPC Classifications
C; C10; C10G; C10G27/00; C10G27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
IN THE PROCESS OF TREATING A HYDROCARBON STREAM WITH AN ACID, THE IMPROVEMENT COMPRISING INCORPIRATING IN SAID STREAM AND AQUEOUS SOLUTION OF A CHELATING AGENT TO CONVERT ACID SLUDGE TO AN AQUEOUS SOLUBLE FROM.
Claim 2
Dependent Claim
34 words
IN THE PROCESS OF TREATING A HYDROCARBON STREAM WITH AN ACID, THE IMPROVEMENT COMPRISING INCORPIRATING IN SAID STREAM AND AQUEOUS SOLUTION OF A CHELATING AGENT TO CONVERT ACID SLUDGE TO AN AQUEOUS SOLUBLE FROM.
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) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |