US2835746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier with automatic volume control
Assignee: Phillips Petroleum Co
•
Filing: 1952-04-07
•
Granted: 1958-05-20
•
Expires: 1972-04-07
Abstract
No abstract record available.
Inventors
- 👤 Orin C Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2326614A
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US2352825A
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US2408001A
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US2523294A
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US2554905A
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US2558954A
Cited
US2582714A
Cited
US2673899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |