Patent US2572497A successfully refreshed from Google Patents.
US2572497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making fine mesh silica screens
Assignee: RCA Corp
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Filing: 1948-11-30
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Granted: 1951-10-23
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Expires: 1968-11-30
Abstract
No abstract record available.
Inventors
- 👤 Law Harold Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:54
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/395; Y; Y10; Y10S; Y10S264/00; Y10S264/70
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
THE METHOD OF FORMING A SILICA SCREEN, SAID METHOD COMPRISING THE STEPS OF, CHEMICALLY PRECIPITATING A COATING OF SILICA UPON A METAL SCREEN, REMOVING SAID METAL SCREEN FROM SAID SILICA COATING BY ACID.
References Cited (Backward Citations)
US533512A
Cited
US2268589A
Cited
US2272342A
Cited
US2156156A
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US2188121A
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US2275952A
Cited
US2240186A
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US2239551A
Cited
US2540623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |