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Patent US1042440A successfully refreshed from Google Patents.
US1042440A
Expired / Lapsed
US
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Electrostatic voltmeter.
Assignee: Individual
•
Filing: 1911-10-13
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Granted: 1912-10-29
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Expires: 1931-10-13
Abstract
No abstract record available.
Inventors
- 👤 John C Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1915-10-29 | 1916-04-29 | 1916-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1919-10-29 | 1920-04-29 | 1920-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1923-10-29 | 1924-04-29 | 1924-10-29 | $7700.00 | Window Closed / Lapsed |