US3844799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless copper plating
Assignee: International Business Machines Corp
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Filing: 1973-12-17
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Granted: 1974-10-29
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Expires: 1993-12-17
Abstract
Abstract By means of constant control of the temperature between 70* and about 80* C. and control of the cyanide ion concentration between 0.0002 and 0.0004 molar, high quality electroless copper plating processes are carried out from solutions containing cupric ions.
Inventors
- 👤 W Underkofler
- 👤 T Zucconi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:17
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23C18/40; C23C18/405
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
AN ELECTROLESS COPPER PLATING PROCESS IN WHICH COPPER IS DEPOSITED FROM A BATH COMPRISING CUPRIC IONS, A REDUCING AGENT, A SURFACTANT, AND A COMPLEXING AGENT FOR CUPRIC IONS, SAID PROCESS BEING CHARECTERIZED BY THE IMPROVEMENT ACCORDING TO WHICH THE TEMPERATURE OF THE BATH IS MAINTAINED CONTINUOUSLY BETWEEN 70*C AND 80*C AND THE BATH IS ADJUSTED TO MAINTAIN CONTINUOUSLY A CYANIDE ION CONCENTRATION WITHIN THE RANGE OF 0.0002 TO 0.0004 MOLAR.
Claim 2
Dependent Claim
70 words
AN ELECTROLESS COPPER PLATING PROCESS IN WHICH COPPER IS DEPOSITED FROM A BATH COMPRISING CUPRIC IONS, A REDUCING AGENT, A SURFACTANT, AND A COMPLEXING AGENT FOR CUPRIC IONS, SAID PROCESS BEING CHARECTERIZED BY THE IMPROVEMENT ACCORDING TO WHICH THE TEMPERATURE OF THE BATH IS MAINTAINED CONTINUOUSLY BETWEEN 70*C AND 80*C AND THE BATH IS ADJUSTED TO MAINTAIN CONTINUOUSLY A CYANIDE ION CONCENTRATION WITHIN THE RANGE OF 0.0002 TO 0.0004 MOLAR.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1 wherein the temperature is maintained within one half degree of 73*C.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 1 wherein the cyanide ion concentration is maintained very close to 0.00025 molar.
Claim 5
Dependent Claim
13 words
A process as claimed in claim 1 wherein the reducing agent is formaldehyde.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1 wherein the complexing agent is ethylenediamine tetraacetic acid.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 wherein the surfactant is an organic phosphate ester.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 wherein the pH is maintained within the range 11.6 to 11.8.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |