US3746023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning oil tanker holds
Assignee: Chevron USA Inc
•
Filing: 1972-03-22
•
Granted: 1973-07-17
•
Expires: 1992-03-22
Abstract
Abstract The hold in an oil tanker which has been emptied of its oil cargo is cleaned by first filling the hold with sea water ballast so that oil vapors are forced from the hold and a residual oil layer floats upon the sea water ballast. The floating oil layer is thereupon skimmed or otherwise removed from the aqueous ballast. The hold is then deballasted and washed with a jet of high pressure sea water.
Inventors
- 👤 B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:59
CPC Classifications
B; B63; B63B; B63B57/00; B63B57/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The process of claim 1 wherein said oil liquid layer is removed by skimming.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein said oil liquid layer is removed by siphoning.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said oil liquid layer is removed by aspiration.
Claim 4
Dependent Claim
40 words
The process of claim 1 wherein the atmosphere in said hold is above the lower explosive limit prior to the aqueous ballast filling step and is below said limit as a result of said aqueous filling and oil removing steps.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |