US2817081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracking system
Assignee: Individual
•
Filing: 1955-01-10
•
Granted: 1957-12-17
•
Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Walter Van B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:22
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/87
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2515332A
Cited
US2462102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |