US2672864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio mask
Assignee: Individual
•
Filing: 1951-07-18
•
Granted: 1954-03-23
•
Expires: 1971-07-18
Abstract
No abstract record available.
Inventors
- 👤 Makara Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:49
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190900632A
Cited
US1148849A
Cited
US1599961A
Cited
US1804688A
Cited
US1816769A
Cited
GB385082A
Cited
US2437049A
Cited
US2470597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |