US2205447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple outlet system for audio frequencies
Assignee: Individual
•
Filing: 1938-08-23
•
Granted: 1940-06-25
•
Expires: 1958-08-23
Abstract
No abstract record available.
Inventors
- 👤 Clarence R Wallace
- 👤 Burgess Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/65; H04H20/76; H04H20/82; G; G09; G09B; G09B19/00; G09B19/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-06-25 | 1943-12-25 | 1944-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-25 | 1947-12-25 | 1948-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-25 | 1951-12-25 | 1952-06-25 | $7700.00 | Window Closed / Lapsed |