Patent US2530842A successfully refreshed from Google Patents.
US2530842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of metal to metal duplications
Assignee: RCA Corp
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Filing: 1949-04-12
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Granted: 1950-11-21
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Expires: 1969-04-12
Abstract
No abstract record available.
Inventors
- 👤 Ernest P Ruggieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A PROCESS OF MAKING MASTER MOLDS USED IN THE MANUFACTURE OF DISC SOUND RECORDS, THE STEPS OF PASSIVATING A METAL REPLICA OF AN ORIGINALLY RECORDED SOUND GROOVE BY TREATING SAID REPLICA WITH AN AQUEOUS SOLUTION OF A STRONG OXIDIZING AGENT FROM THE CLASS CONSISTING OF ALKALI METAL DICHROMATES AND PERMANGANATES, SAID METAL HAVING A SURFACE OF ONE OF THE CLASS CONSISTING OF GOLD, SILVER AND PLATINUM, RINSING SAID PASSIVATED SURFACE WITH WATER AT TEMPERATURES OF
Claim 2
Dependent Claim
76 words
IN A PROCESS OF MAKING MASTER MOLDS USED IN THE MANUFACTURE OF DISC SOUND RECORDS, THE STEPS OF PASSIVATING A METAL REPLICA OF AN ORIGINALLY RECORDED SOUND GROOVE BY TREATING SAID REPLICA WITH AN AQUEOUS SOLUTION OF A STRONG OXIDIZING AGENT FROM THE CLASS CONSISTING OF ALKALI METAL DICHROMATES AND PERMANGANATES, SAID METAL HAVING A SURFACE OF ONE OF THE CLASS CONSISTING OF GOLD, SILVER AND PLATINUM, RINSING SAID PASSIVATED SURFACE WITH WATER AT TEMPERATURES OF
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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |