US2949778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical instrument
Assignee: Daystrom Inc
•
Filing: 1958-04-01
•
Granted: 1960-08-23
•
Expires: 1978-04-01
Abstract
No abstract record available.
Inventors
- 👤 John R Hemion
- 👤 Covalence Paul
- 👤 Kenneth J Riddle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/20; G01K1/24; G01R; G01R11/00; G01R11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE178860C
Cited
US1639365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |