US2745508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone support
Assignee: DICTOGRAPH PRODUCTS CO Inc
•
Filing: 1952-09-11
•
Granted: 1956-05-15
•
Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 Charles W Vadersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:18
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1078746A
Cited
FR790909A
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US2166326A
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US2194070A
Cited
US2440078A
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US2417153A
Cited
US2508581A
Cited
US2627932A
Cited
US2604182A
Cited
US2533516A
Cited
US2643729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |