US2428464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for etching metal
Assignee: Westinghouse Electric Corp
•
Filing: 1945-02-09
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Granted: 1947-10-07
•
Expires: 1965-02-09
Abstract
No abstract record available.
Inventors
- 👤 John C Lum
- 👤 George W Jernstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1434798A
Cited
US1776535A
Cited
US1994500A
Cited
GB412641A
Cited
US2037633A
Cited
US2087230A
Cited
US2311047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |