US2520172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
-sound intensifier
Assignee: —
•
Filing: —
•
Granted: 1950-08-29
•
Expires: 1967-08-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:29
CPC Classifications
—
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1015622A
Cited
US1289065A
Cited
US1757459A
Cited
US1759614A
Cited
US1681208A
Cited
US1837755A
Cited
US1837385A
Cited
US1913262A
Cited
US2031500A
Cited
US2426928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |