Patent US3887330A successfully refreshed from Google Patents.
US3887330A
Expired / Lapsed
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Sulfur-hydrocarbon slurry pipeline transportation containing an inorganic corrosion inhibitor
Assignee: Shell USA Inc
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Filing: 1973-01-08
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Granted: 1975-06-03
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Expires: 1993-01-08
Abstract
Abstract A process for preventing plugging and corrosion of conduits used in making and transporting sulfur in the form of a sulfur-liquid hydrocarbon slurry by addition prior to, during, or after preparation of the slurry of a small amount of ammonium polysulfide or ammonium hydrosulfide.
Inventors
- 👤 Richard J Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:25
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
43 words
A METHOD FOR PREVENTING THE SULFUR CORROSION IF FERROUS MATERIALS IN CONTACT WITH A SULFUR-HYDROCARBON SLURRY COMPRISING ADMIXING AMMONIUM POLYSULFIDE WITH THE SLURRY, THE AMMONIUM POLYSULFIDE COMPRISING AN AQUEOUS SOLUTION OF FROM ABOUT 0.01% TO ABOUT 10% BY WEIGHT BASED ON TOTAL SLURRY.
Claim 2
Independent Claim
43 words
A METHOD FOR PREVENTING THE SULFUR CORROSION IF FERROUS MATERIALS IN CONTACT WITH A SULFUR-HYDROCARBON SLURRY COMPRISING ADMIXING AMMONIUM POLYSULFIDE WITH THE SLURRY, THE AMMONIUM POLYSULFIDE COMPRISING AN AQUEOUS SOLUTION OF FROM ABOUT 0.01% TO ABOUT 10% BY WEIGHT BASED ON TOTAL SLURRY.
Claim 3
Independent Claim
43 words
A method for preventing the sulfur corrosion of ferrous materials in contact with a sulfur-hydrocarbon slurry comprising admixing ammonium polysulfide with the slurry, the ammonium polysulfide comprising an aqueous solution of from about 0.01% to about 10% by weight based on total slurry.
Claim 4
Independent Claim
43 words
A method for preventing the sulfur corrosion of ferrous materials in contact with a sulfur-hydrocarbon slurry comprising admixing ammonium polysulfide with the slurry, the ammonium polysulfide comprising an aqueous solution of from about 0.01% to about 10% by weight based on total slurry.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |