US2572183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplitude-modulation-frequency-modulation antenna
Assignee: Philips North America LLC
•
Filing: 1949-04-28
•
Granted: 1951-10-23
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Frank H Nelson
- 👤 Robert H Dreisbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:08
CPC Classifications
H; H01; H01Q; H01Q5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19854E
Cited
US2021734A
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US2074896A
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US2143159A
Cited
US2189309A
Cited
US2117154A
Cited
US2222406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |