US2857587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse train indicator
Assignee: Individual
•
Filing: 1955-10-17
•
Granted: 1958-10-21
•
Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Robert D Tollefson
- 👤 Jefferson R Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2110015A
Cited
US2374248A
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US2380520A
Cited
US2428058A
Cited
US2541052A
Cited
US2517599A
Cited
US2491029A
Cited
US2536808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |