Patent US3216857A successfully refreshed from Google Patents.
US3216857A
Expired / Lapsed
US
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Process for removal of carbonaceous deposits
Assignee: Diversey Wyandotte Corp
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Filing: 1962-05-21
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Granted: 1965-11-09
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Expires: 1982-05-21
Abstract
No abstract record available.
Inventors
- 👤 Jacque L Duvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:22
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/08; C11D1/00; C11D1/02; C11D1/12; C11D1/22; C11D3/00; C11D3/16; C11D3/34; C11D3/349; C23; C23G; C23G1/00; C23G1/02; C11D3/3418; C11D3/3427; C11D3/3436
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF REMOVING FROM METAL PARTS CARBONACEOUS DEPOSITS OF THE TYPE PRODUCED IN GAS TURBINE-TYPE ENGINES COMPRISING IMMERSING SAID PARTS FOR A PERIOD OF FROM ABOUT 30 MINUTES TO 2 HOURS AT A TEMPERATURE RANGING FROM ABOUT 160* TO 180*F. IN A COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT OF DRY INGREDIENTS, 90.1% SODIUM BISULFATE, 5.0% SODIUM OXALATE, 2.4% OF AN 85% ACTIVE SODIUM ALKYLBENZENESULFONATE WHEREIN THE ALKYL GROUP HAS FROM ABOUT 10 TO 18 CARBON ATOMS, 2.0% OF 1,3-DIETHYLTHIOUREA AND 0.5% OF DI-O-TOLYLTHIOUREA DISSOLVED IN WATER TO FORM A 9-12% BY WEIGHT AQUEOUS SOLUTION OF SAID DRY INGREDIENTS, BALANCE WATER.
Claim 2
Independent Claim
101 words
THE METHOD OF REMOVING FROM METAL PARTS CARBONACEOUS DEPOSITS OF THE TYPE PRODUCED IN GAS TURBINE-TYPE ENGINES COMPRISING IMMERSING SAID PARTS FOR A PERIOD OF FROM ABOUT 30 MINUTES TO 2 HOURS AT A TEMPERATURE RANGING FROM ABOUT 160* TO 180*F. IN A COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT OF DRY INGREDIENTS, 90.1% SODIUM BISULFATE, 5.0% SODIUM OXALATE, 2.4% OF AN 85% ACTIVE SODIUM ALKYLBENZENESULFONATE WHEREIN THE ALKYL GROUP HAS FROM ABOUT 10 TO 18 CARBON ATOMS, 2.0% OF 1,3-DIETHYLTHIOUREA AND 0.5% OF DI-O-TOLYLTHIOUREA DISSOLVED IN WATER TO FORM A 9-12% BY WEIGHT AQUEOUS SOLUTION OF SAID DRY INGREDIENTS, BALANCE WATER.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |