US3172854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition process
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:11
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; C07D233/16; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD FOR PROTECTING FERROUS METAL EQUIPMENT EXPOSED TO CORROSION OF OIL WELL FLUID WHICH COMPRISES THE STEPS OF: ADDING TO SAID OIL WELL FLUID A CORROSION-INHIBITING QUANTITY FROM ABOUT 2.5 PARTS PER MILLION TO ABOUT 5 PARTS PER MILLION OF AN IMIDAZOLINE SELECTED FROM THE GROUP CONSISTING OF A GUANIDINO-IMIDAZOLINE COMPOUNDS AND MIXTURES THEREOF, SAID COMPOUND BEING REPRESENTED BY THE FORMULA:
Claim 2
Independent Claim
62 words
A METHOD FOR PROTECTING FERROUS METAL EQUIPMENT EXPOSED TO CORROSION OF OIL WELL FLUID WHICH COMPRISES THE STEPS OF: ADDING TO SAID OIL WELL FLUID A CORROSION-INHIBITING QUANTITY FROM ABOUT 2.5 PARTS PER MILLION TO ABOUT 5 PARTS PER MILLION OF AN IMIDAZOLINE SELECTED FROM THE GROUP CONSISTING OF A GUANIDINO-IMIDAZOLINE COMPOUNDS AND MIXTURES THEREOF, SAID COMPOUND BEING REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |