Patent US2678876A successfully refreshed from Google Patents.
US2678876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning of metal surfaces
Assignee: RCA Corp
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Filing: 1950-12-26
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Granted: 1954-05-18
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Expires: 1970-12-26
Abstract
No abstract record available.
Inventors
- 👤 Don G Burnside
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:49
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/68; H; H05; H05K; H05K3/00; H05K3/38; H05K3/382; H05K3/385
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A METHOD OF IMPARTING A MAT FINISH TO A POLISHED SURFACE OF A METAL OF THE CLASS CONSISTING OF COPPER AND BRASS, THE STEPS OF TREATING SAID SURFACE WITH A SOLUTION CONSISTING ESSENTIALLY OF WATER, ABOUT 10-40% BY WEIGHT OF AMMONIUM PERSULFATE, AND ABOUT 0.3 TO ABOUT 1.5% BY VOLUME OF HYDROGEN PEROXIDE, AND CONTINUING SAID TREATMENT UNTIL SAID MAT FINISH HAS BEEN FORMED.
Claim 2
Dependent Claim
65 words
IN A METHOD OF IMPARTING A MAT FINISH TO A POLISHED SURFACE OF A METAL OF THE CLASS CONSISTING OF COPPER AND BRASS, THE STEPS OF TREATING SAID SURFACE WITH A SOLUTION CONSISTING ESSENTIALLY OF WATER, ABOUT 10-40% BY WEIGHT OF AMMONIUM PERSULFATE, AND ABOUT 0.3 TO ABOUT 1.5% BY VOLUME OF HYDROGEN PEROXIDE, AND CONTINUING SAID TREATMENT UNTIL SAID MAT FINISH HAS BEEN FORMED.
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) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |