Patent US2429088A successfully refreshed from Google Patents.
US2429088A
Expired / Lapsed
US
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Production of electrical condenser plates
Assignee: Johnson Matthey PLC
•
Filing: 1943-05-19
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Granted: 1947-10-14
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Expires: 1963-05-19
Abstract
No abstract record available.
Inventors
- 👤 Box Ernest Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:04
CPC Classifications
H; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1123422A
Cited
US1300394A
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US1922387A
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US1977625A
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GB440948A
Cited
FR790617A
Cited
US2130215A
Cited
US2161888A
Cited
US2156414A
Cited
US2262791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |