Patent US3293831A successfully refreshed from Google Patents.
US3000800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper-electroplating baths
Assignee: Dehydag Deutsche Hydrierwerke GmbH
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Filing: 1958-04-14
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Granted: 1961-09-19
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Expires: 1978-04-14
Abstract
No abstract record available.
Inventors
- 👤 Strauss Wennemar
- 👤 Wedell Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:50
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PRODUCING A SMOOTH, BRIGHT COPPER ELECTROPLATE ON A ROUGH SURFACE METAL BASE FROM ACIDIC COPPER PLATING BATHS CONTAINING A SULFONIC ACID BRIGHTENING AGENT HAVING A CARBON ATOM LINKED EXCLUSIVELY TO HETEROATOMS, SAID CARBON ATOM BEING FURTHER LINKED THROUGH A SULFUR ATOM TO A LOWER ALIPHATIC CHAIN WHICH CARRIES THE SULFONIC RADICAL WHICH COMPRISES ADDING TO SAID BATH A DERIVATIVE OF THIOUREA AS A SMOOTHING AGENT OF THE FORMULA
Claim 2
Dependent Claim
71 words
A PROCESS FOR PRODUCING A SMOOTH, BRIGHT COPPER ELECTROPLATE ON A ROUGH SURFACE METAL BASE FROM ACIDIC COPPER PLATING BATHS CONTAINING A SULFONIC ACID BRIGHTENING AGENT HAVING A CARBON ATOM LINKED EXCLUSIVELY TO HETEROATOMS, SAID CARBON ATOM BEING FURTHER LINKED THROUGH A SULFUR ATOM TO A LOWER ALIPHATIC CHAIN WHICH CARRIES THE SULFONIC RADICAL WHICH COMPRISES ADDING TO SAID BATH A DERIVATIVE OF THIOUREA AS A SMOOTHING AGENT OF THE FORMULA
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |