US2548011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonic teacher
Assignee: Individual
•
Filing: 1949-03-15
•
Granted: 1951-04-10
•
Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Loyd T Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:16
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/04; G06; G06K; G06K7/00; G06K7/08; G06K7/089; G09; G09B; G09B5/00; G09B5/06; G09B5/062; G11B5/00; G11B2005/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |