US2561182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sharp frequency discriminator
Assignee: General Precision Laboratory Inc
•
Filing: 1948-05-26
•
Granted: 1951-07-17
•
Expires: 1968-05-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:15
CPC Classifications
H; H03; H03D; H03D13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2044749A
Cited
US2207540A
Cited
US2176742A
Cited
US2274434A
Cited
US2422386A
Cited
US2473853A
Cited
US2479817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |