US2805289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double signal amplifying system
Assignee: US Philips Corp
•
Filing: 1952-05-20
•
Granted: 1957-09-03
•
Expires: 1972-05-20
Abstract
No abstract record available.
Inventors
- 👤 Buijs Pieter Klaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:38
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1859565A
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US2008082A
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US2075861A
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US2073458A
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US2144995A
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US2173222A
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US2256512A
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US2296626A
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US2248783A
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US2245340A
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US2333081A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |