US3920392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for inhibiting corrosion of metal using polysulfone compounds
Assignee: Nitto Boseki Co Ltd
•
Filing: 1973-01-24
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Granted: 1975-11-18
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Expires: 1993-01-24
Abstract
Abstract A metal corrosion inhibitor consisting of a polysulfone compound obtained by copolymerizing or interpolymerizing sulfur dioxide and at least one 1,6-diene compound. The above metal corrosion inhibitor may be added in a corrosion-inhibitorily effective amount, preferably at least 1 ppm., to a corrosive medium, with which a metal comes into contact, to inhibit the medium from corroding the metal.
Inventors
- 👤 Susumu Harada
- 👤 Masami Haruta
- 👤 Tadashi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:59
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A METHOD FOR INHIBITING THE CORROSION OF A METAL WHICH COMPRISES ADDING TO A CORROSIVE MEDIUM WITH WHICH THE METAL COMES INTO CONTACT A CORROSION-INHIBITORILY EFFECTIVE AMOUNT OF A METAL CORROSION INHIBITOR REPRESENTED BY THE GENERAL FORMULA
Claim 2
Independent Claim
37 words
A METHOD FOR INHIBITING THE CORROSION OF A METAL WHICH COMPRISES ADDING TO A CORROSIVE MEDIUM WITH WHICH THE METAL COMES INTO CONTACT A CORROSION-INHIBITORILY EFFECTIVE AMOUNT OF A METAL CORROSION INHIBITOR REPRESENTED BY THE GENERAL FORMULA
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein the corrosive medium is water, an aqueous salt solution or an inorganic or organic acid.
Claim 4
Dependent Claim
25 words
A method according to claim 1, wherein the metal corrosion inhibitor is added in an amount of at least 1 ppm to the corrosive medium.
Claim 5
Dependent Claim
22 words
A method according to claim 3, wherein the corrosive meium is water, an aqueous salt solution of an inorganic or organic acid.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein the metal corrosion inhibitor is added in an amount of at least 5 ppm to the corrosive medium.
Claim 7
Dependent Claim
22 words
A method according to claim 5, wherein the corrosive medium is water, an aqueous salt solution or an inorganic or organic acid.
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Cited
US3730901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |