US2447333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-audible sound reception
Assignee: United States Department of the Navy
•
Filing: 1931-12-30
•
Granted: 1948-08-17
•
Expires: 1951-12-30
Abstract
No abstract record available.
Inventors
- 👤 Harvey C Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:04
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1807658A
Cited
US1380981A
Cited
US1471547A
Cited
US1481946A
Cited
GB145691A
Cited
US1562950A
Cited
US1584613A
Cited
US2248870A
Cited
FR613799A
Cited
US1802781A
Cited
FR664037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |