Patent US3587515A successfully refreshed from Google Patents.
Patent US3261774A successfully refreshed from Google Patents.
US3261774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reducing fouling in refining of petroleum products
Assignee: ChampionX LLC
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Filing: 1965-09-01
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Granted: 1966-07-19
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Expires: 1985-09-01
Abstract
No abstract record available.
Inventors
- 👤 John D Newkirk
- 👤 Richard M Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:00
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2633; C07; C07C; C07C7/00; C07C7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN APROCESS WHEREIN A HYDROCARBON STOCK IS PASSED IN DIRECT, HEAT EXCHANGE CONTACT WITH A HEAT EXCHANGE SURFACE HAVING A SURFACE TEMPRATURE OF ABOUT 100*F. TO 2000*F. TO HEAT SAID STOCK TO A PROCESSING TEMPERATURE, THE IMPROVEMENT COMPRISING INHIBITING THE FOULING BY ORGAIC AND INORGANIC DEPOSITS FROM SAID HYDROCARBON STOCK ON SAID HEAT EXCHANGE SURFACE BY INCORPORATING IN SAID HYDROCARBON STOCK AN N-ALKYL AMIDOPHOSPHORIC ACID SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
71 words
IN APROCESS WHEREIN A HYDROCARBON STOCK IS PASSED IN DIRECT, HEAT EXCHANGE CONTACT WITH A HEAT EXCHANGE SURFACE HAVING A SURFACE TEMPRATURE OF ABOUT 100*F. TO 2000*F. TO HEAT SAID STOCK TO A PROCESSING TEMPERATURE, THE IMPROVEMENT COMPRISING INHIBITING THE FOULING BY ORGAIC AND INORGANIC DEPOSITS FROM SAID HYDROCARBON STOCK ON SAID HEAT EXCHANGE SURFACE BY INCORPORATING IN SAID HYDROCARBON STOCK AN N-ALKYL AMIDOPHOSPHORIC ACID SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |