Patent US2840525A successfully refreshed from Google Patents.
US2840525A
Expired / Lapsed
US
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Method of inhibiting corrosion of metal surfaces
Assignee: Pan American Petroleum Corp
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Filing: 1956-08-02
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Granted: 1958-06-24
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Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 Loyd W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:49
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/143; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF INHIBITING CORROSION OF METAL SURFACES BY FLUIDS CONTAINING WATER AND A MEMBER OF THE GROUP OF CORROSIVE MATERIALS CONSISTING OF OXYGEN, HYDROGEN SULFIDE, CARBON DIOXIDE, CARBOXYLIC ACID CONTAINING FROM 2 TO 4 CARBON ATOMS PER MOLECULE, AND COMBINATIONS OF THESE INDIVIDUAL CORROSIVE MATERIALS, COMPRISING ADDING TO SAID FLUIDS AT LEAST ABOUT 5 PARTS PER MILLION BY WEIGHT OF A POLYAMINE SALT OF A CARBOXYLIC ACID, SAID ACID BEING DERIVED BY LIQUID PHASE PARTIAL OXIDATION OF A NORMALLYLIQUID PETROLEUM FRACTION, AND SAID POLYAMINE HAVING THE FORMULA RNHR''NH2, WHEREIN R IS A HYDROCARBON RADICAL CONTAINING AT LEAST ABOUT 10 CARBON ATOMS, N IS A NITROGEN ATOM, H IS A HYDROGEN ATOM, AND R'' IS A HYDROCARBON RADICAL CONTAINING FROM 2 TO 4 CARBON ATOMS.
Claim 2
Independent Claim
125 words
A METHOD OF INHIBITING CORROSION OF METAL SURFACES BY FLUIDS CONTAINING WATER AND A MEMBER OF THE GROUP OF CORROSIVE MATERIALS CONSISTING OF OXYGEN, HYDROGEN SULFIDE, CARBON DIOXIDE, CARBOXYLIC ACID CONTAINING FROM 2 TO 4 CARBON ATOMS PER MOLECULE, AND COMBINATIONS OF THESE INDIVIDUAL CORROSIVE MATERIALS, COMPRISING ADDING TO SAID FLUIDS AT LEAST ABOUT 5 PARTS PER MILLION BY WEIGHT OF A POLYAMINE SALT OF A CARBOXYLIC ACID, SAID ACID BEING DERIVED BY LIQUID PHASE PARTIAL OXIDATION OF A NORMALLYLIQUID PETROLEUM FRACTION, AND SAID POLYAMINE HAVING THE FORMULA RNHR''NH2, WHEREIN R IS A HYDROCARBON RADICAL CONTAINING AT LEAST ABOUT 10 CARBON ATOMS, N IS A NITROGEN ATOM, H IS A HYDROGEN ATOM, AND R'' IS A HYDROCARBON RADICAL CONTAINING FROM 2 TO 4 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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |