US2950357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic sound transmitting device
Assignee: Individual
•
Filing: 1956-05-01
•
Granted: 1960-08-23
•
Expires: 1976-05-01
Abstract
No abstract record available.
Inventors
- 👤 Robert E Mitchell
- 👤 Stanley K Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/55; H04R25/554
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2319627A
Cited
US2430229A
Cited
US2487038A
Cited
US2485405A
Cited
US2461344A
Cited
US2544027A
Cited
US2613282A
Cited
DE922889C
Cited
US2765373A
Cited
FR1089681A
Cited
US2777057A
Cited
US2787670A
Cited
US2830132A
Cited
US2775652A
Cited
US2824177A
Cited
US2856466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |