US3940248A
Expired / Lapsed
US
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Method for inhibiting corrosion of metal
Assignee: Otsuka Kagaku Yakuhin KK
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Filing: 1973-06-13
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Granted: 1976-02-24
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Expires: 1993-06-13
Abstract
Abstract A corrosion inhibiting composition which comprises an aqueus medium having dissolved therein an effective amount of at least one of water-soluble 8-hydroxy-s-triazolo[b]pyridazine compounds and watersoluble salts thereof, said water-soluble 8-hydroxy-s-triazolo[b]pyridazine compound having the formula of ##SPC1## Wherein R 1 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms: R 2 is hydrogen atom, an alkyl group having 1 to 10 carbon atoms, phenyl, hydroxyphenyl, nitrophenyl, benzyl, hydroxybenzyl or nitrobenzyl group; and a method for inhibiting corrosion of a metal which comprises contacting a metal with said composition.
Inventors
- 👤 Hideo Yamaguchi
- 👤 Takashi Kawasaki
- 👤 Shigeo Takahashi
- 👤 Akiyoshi Inubuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:25
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; Y; Y10; Y10S; Y10S422/00; Y10S422/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A method for inhibiting corrosion of metal which comprises contacting a metal with a composition consisting essentially of an aqueous medium having dissolved therein an amount in the range of from 0.001 to 5 weight percent of at least one water-soluble 8-hydroxy-s-triazolo (b) pyridazine compound and water-soluble salts thereof selected from the group consisting of ammonium salts, alkali metal salts, hydrazine salts and amine salts, said water-soluble 8-hydroxy-s-triazolo(b)-pyradazine compound having the formula of ##SPC3## wherein R 1 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms: R 2 is hydrogen atom, an alkyl having 1 to 10 carbon atoms, phenyl, hydroxyphenyl, nitrophenyl, benzyl, hydroxybenzyl or nitrobenzyl group.
Claim 2
Independent Claim
111 words
A method for inhibiting corrosion of metal which comprises contacting a metal with a composition consisting essentially of an aqueous medium having dissolved therein an amount in the range of from 0.001 to 5 weight percent of at least one water-soluble 8-hydroxy-s-triazolo (b) pyridazine compound and water-soluble salts thereof selected from the group consisting of ammonium salts, alkali metal salts, hydrazine salts and amine salts, said water-soluble 8-hydroxy-s-triazolo(b)-pyradazine compound having the formula of ##SPC3## wherein R 1 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms: R 2 is hydrogen atom, an alkyl having 1 to 10 carbon atoms, phenyl, hydroxyphenyl, nitrophenyl, benzyl, hydroxybenzyl or nitrobenzyl group.
Claim 3
Dependent Claim
32 words
The method of inhibiting corrosion of a metal according to claim 1, wherein said metal to be contacted with said composition is at least one of iron, copper, zinc and alloys thereof.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |