US1006429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for transmitting sound-waves.
Assignee: Nat Electric & Magnetic Co
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Filing: 1907-04-17
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Granted: 1911-10-17
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Expires: 1927-04-17
Abstract
No abstract record available.
Inventors
- 👤 Fred Harvey Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:58
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/20; H04B5/24; H04B5/26; H04B5/266
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) | 1914-10-16 | 1915-04-17 | 1915-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-10-16 | 1919-04-17 | 1919-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-10-16 | 1923-04-17 | 1923-10-17 | $7700.00 | Window Closed / Lapsed |