US1287970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement of apparatus for the detection and measurement of alternating currents and other currents of periodic nature.
Assignee: Individual
•
Filing: 1916-12-02
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Granted: 1918-12-17
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Expires: 1936-12-02
Abstract
No abstract record available.
Inventors
- 👤 Heinrich Greinacher
- 👤 Carl W Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/16
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) | 1921-12-16 | 1922-06-17 | 1922-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-12-16 | 1926-06-17 | 1926-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-12-16 | 1930-06-17 | 1930-12-17 | $7700.00 | Window Closed / Lapsed |