US2815086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible loudspeaker system
Assignee: Individual
•
Filing: 1954-02-18
•
Granted: 1957-12-03
•
Expires: 1974-02-18
Abstract
No abstract record available.
Inventors
- 👤 William L Hartsfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:52
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865; H04R1/30; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/24777; Y10T428/24785; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T428/2933; Y10T428/2936; Y10T428/2938
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |