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US1864809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud speaker
Assignee: Philips North America LLC
•
Filing: 1930-01-08
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Granted: 1932-06-28
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Expires: 1950-01-08
Abstract
No abstract record available.
Inventors
- 👤 Dempster Burgess
- 👤 Arthur R Bruehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:17
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025
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) | 1935-06-28 | 1935-12-28 | 1936-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-06-28 | 1939-12-28 | 1940-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-06-28 | 1943-12-28 | 1944-06-28 | $7700.00 | Window Closed / Lapsed |