Patent US3790897A successfully refreshed from Google Patents.
Patent US3833010A successfully refreshed from Google Patents.
US3833010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning gasoline storage tanks
Assignee: Shell USA Inc
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Filing: 1973-03-20
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Granted: 1974-09-03
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Expires: 1993-03-20
Abstract
Abstract Service station gasoline storage tanks are cleaned by jet spraying a high viscosity cleaning fluid such as aqueous cellulose gum solution by means of a rotating nozzle over the interior surface of the tanks with sufficient pressure to break loose rust and hydrocarbon deposits and pumping out the cleaning fluid containing the suspended deposits along with other debris.
Inventors
- 👤 Dermott D Mc
- 👤 E Seymour
- 👤 P Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:05
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/08; B08B9/093; C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/22; C11D3/222; C11D3/37; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
10 words
The method of claim 1 wherein the hydrocarbon is gasoline.
Claim 2
Dependent Claim
15 words
The method of claim 1 wherein the storage tank is a service station gasoline tank.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the high viscosity fluid is jet sprayed.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the high viscosity fluid is sprayed through a rotating nozzle.
Claim 5
Independent Claim
70 words
A method for cleaning a service station gasoline storage tank comprising: directing a 1 percent by weight solution in water of hydroxyethylcellulose having a viscosity which ranges from about 2,500 to about 4,000 centipoises against the interior surface of the tank with sufficient pressure to break loose rust and hydrocarbon deposits, whereby the deposits become suspended in the aqueous solution; and pumping out the cleaning fluid containing the suspended deposits.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |