US4450102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur based metal cleaners and corrosion inhibitors
Assignee: Phillips Petroleum Co
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Filing: 1982-11-02
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Granted: 1984-05-22
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Expires: 2002-11-02
Abstract
Abstract Novel compositions are provided for the cleaning and inhibiting corrosion of metallic surfaces. The cleaning composition has an active ingredient consisting of at least one sulfur containing compound selected from the group consisting of a bis(N-2 pyrrolidonyl), an (N-2 pyrrolidonyl), or a bis(N-succinimidyl) sulfur-containing compound.
Inventors
- 👤 Merlin R. Lindstrom
- 👤 Gary D. Macdonell
- 👤 Rector P. Louthan
- 👤 Donald H. Kubicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:00
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23G; C23G1/00; C23G1/14; C23G1/16; C23G1/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
An aqueous composition having as the active ingredient 2-(N-2-pyrrolidino)ethyl-2-hydroxyethyl sulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
Claim 2
Dependent Claim
25 words
An aqueous composition having as the active ingredient 2-(N-2-pyrrolidino)ethyl-2-hydroxyethyl sulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
Claim 3
Dependent Claim
25 words
An aqueous composition having as the active ingredient 2-(N-2-pyrrolidonyl)ethyl-2-carboxylethyl sulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
Claim 4
Dependent Claim
25 words
An aqueous composition having as the active ingredient 2-(N-2-pyrrolidonyl)ethyl-2-carboxylethyl sulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
Claim 5
Dependent Claim
25 words
An aqueous composition having as the active ingredient bis(2-[N-2-pyrrolidonyl]ethyl) disulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
Claim 6
Dependent Claim
25 words
An aqueous composition having as the active ingredient bis(2-[N-2-pyrrolidonyl]ethyl) disulfide present in an amount of from about 0.25 to 20.0 weight percent of the composition.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |