US2561747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volume limiting amplifier
Assignee: AT&T Inc
•
Filing: 1945-09-18
•
Granted: 1951-07-24
•
Expires: 1965-09-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Josiah L Merrill
- 👤 George C Reier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:26
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2084135A
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US2256071A
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US2181579A
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US2231542A
Cited
US2231558A
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US2378620A
Cited
US2390773A
Cited
US2425002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |