US4698124A
Expired / Lapsed
US
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Method of regenerating permanganate etch bath
Assignee: MacDermid Acumen Inc
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Filing: 1986-06-27
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Granted: 1987-10-06
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Expires: 2006-06-27
Abstract
Abstract A method is provided for regenerating the spent permanganate ions in an alkaline permanganate-containing etchant composition by adding to the composition an oxidizer selected from the group consisting of an inorganic bromate, hypochlorite, chlorite, chlorate, peroxydisulfate, monopersulfate and mixtures thereof.
Inventors
- 👤 Gerald Krulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:40
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22; C23C18/1601; C23C18/1617; C23F; C23F1/00; C23F1/46; H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0055
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A method for regenerating the spent permanganate ions in an alkaline permanganate-containing etchant composition, said method comprising periodically adding to the composition, in an amount sufficient to oxidize essentially all of the non-permanganate manganese species in the composition to permanganate, an oxidizer selected from the group consisting of an inorganic peroxydisulfate, mixtures of an inorganic peroxydisulfate and an inorganic hypochlorite, and mixtures of an inorganic peroxydisulfate and an inorganic chlorate.
Claim 2
Independent Claim
70 words
A method for regenerating the spent permanganate ions in an alkaline permanganate-containing etchant composition, said method comprising periodically adding to the composition, in an amount sufficient to oxidize essentially all of the non-permanganate manganese species in the composition to permanganate, an oxidizer selected from the group consisting of an inorganic peroxydisulfate, mixtures of an inorganic peroxydisulfate and an inorganic hypochlorite, and mixtures of an inorganic peroxydisulfate and an inorganic chlorate.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the oxidizer is an inorganic peroxydisulfate.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the oxidizer is a mixture of an inorganic peroxydisulfate and an inorganic hypochlorite.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the oxidizer is a mixture of an inorganic peroxydulsulfate and an inorganic chlorate.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |