US2777997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic delay lines
Assignee: Individual
•
Filing: 1951-11-06
•
Granted: 1957-01-15
•
Expires: 1971-11-06
Abstract
No abstract record available.
Inventors
- 👤 David L Arenberg
- 👤 Robert M Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2540720A
Cited
US2505364A
Cited
US2472600A
Cited
US2505515A
Cited
US2624804A
Cited
US2525861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |