US2831178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for discrimination and reception of call signals and alarm signals
Assignee: NORTH AMERICAN PHILLIPS COMPAN
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Filing: 1955-04-05
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Granted: 1958-04-15
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Expires: 1975-04-05
Abstract
No abstract record available.
Inventors
- 👤 Ensink Johannes
- 👤 Verhagen Jan
- 👤 Beijnink Willem
- 👤 Hendrikus Cornelis Van Rossum
- 👤 Jurgens Arie Hermanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:45
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/14; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |