Patent US5884970A successfully refreshed from Google Patents.
Patent US2643205A successfully refreshed from Google Patents.
US2643205A
Expired / Lapsed
US
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Removal of carbonaceous deposits from process equipment
Assignee: Pure Oil Co
•
Filing: 1949-12-27
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Granted: 1953-06-23
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Expires: 1969-12-27
Abstract
No abstract record available.
Inventors
- 👤 Christopher A Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:16
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
AN METHOD OF REMOVING CARBONACEOUS DEPOSITS FROM THE SURFACES OF CHEMICAL PROCESS EQUIPMENT COMPRISING APPLYING THERETO SPENT ALKYLATION SULFURIC ACID, DRAINING THE ACID FROM THE EQUIPMENT AFTER ABOUT 30 MINUTES AND FLUSHING THE EQUIPMENT WITH AQUEOUS SOLVENT.
Claim 2
Independent Claim
37 words
AN METHOD OF REMOVING CARBONACEOUS DEPOSITS FROM THE SURFACES OF CHEMICAL PROCESS EQUIPMENT COMPRISING APPLYING THERETO SPENT ALKYLATION SULFURIC ACID, DRAINING THE ACID FROM THE EQUIPMENT AFTER ABOUT 30 MINUTES AND FLUSHING THE EQUIPMENT WITH AQUEOUS SOLVENT.
References Cited (Backward Citations)
GB510733A
Cited
US2419076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |