US4541902A
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Analytical method for determining formaldehyde in electroless copper plating bath
Assignee: C Uyemura & Co Ltd
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Filing: 1984-11-07
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Granted: 1985-09-17
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Expires: 2004-11-07
Abstract
Abstract An analytical method for determining by potentiometric titration formaldehyde in an electroless copper plating bath, which comprises using a hydroxylamine salt such as hydroxylamine hydrochloride as the titrant and using a silver electrode as the indicator electrode. This method can determine free formaldehyde in low concentration which takes part in the plating reaction.
Inventors
- 👤 Akemi Kinoshita
- 👤 Ken Araki
- 👤 Hidemi Nawafune
- 👤 Shozo Mizumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:34
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16; G01N31/162; G01N31/164
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
An analytical method for determining by potentiometric titration formaldehyde in an electroless copper plating bath, which comprises using a hydroxylamine salt as the titrant and using a silver electrode as the indicator electrode.
Claim 2
Dependent Claim
33 words
An analytical method for determining by potentiometric titration formaldehyde in an electroless copper plating bath, which comprises using a hydroxylamine salt as the titrant and using a silver electrode as the indicator electrode.
Claim 3
Dependent Claim
25 words
An analytical method defined in claim 1, wherein the hydroxylamine salt is selected from the group consisting of hydrocylamine hydrochloride, hydroxylamine sulfate and hydroxylamine oxalane.
Claim 4
Dependent Claim
14 words
An analytical method defined in claim 2, wherein the hydroxylamine salt is hydroxylamihne hydrochloride.
Claim 5
Dependent Claim
33 words
An analytical method defined in claim 3, wherein the reference electrode for potentiometric titration is one which is selected from a silver chloride electrode, calomel electrode, platinum electrode, gold electrode, and silver electrode.
Claim 6
Dependent Claim
26 words
An alanlytical method defined in claim 3, wherein the electroless copper plating bath is one which contains a compound that forms an addition product with formaldehyde.
Claim 7
Dependent Claim
33 words
An analytical method defined in claim 2, wherein the reference electrode for potentiometric titration is one which is selected from a silver chloride electrode, calomel electrode, platinum electrode, gold electrode, and silver electrode.
Claim 8
Dependent Claim
26 words
An alanlytical method defined in claim 2, wherein the electroless copper plating bath is one which contains a compound that forms an addition product with formaldehyde.
Claim 9
Dependent Claim
33 words
An analytical method defined in claim 1, wherein the reference electrode for potentiometric titration is one which is selected from a silver chloride electrode, calomel electrode, platinum electrode, gold electrode, and silver electrode.
Claim 10
Dependent Claim
26 words
An analytical method defined in claim 8, wherein the electroless copper plating bath is one which contains a compound that forms an addition product with formaldehyde.
Claim 11
Dependent Claim
26 words
An analytical method defined in claim 1, wherein the electroless copper plating bath is one which contains a compound that forms an addition product with formaldehyde.
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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |