US2499475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for registering the locations of personnel
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1947-04-15
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Granted: 1950-03-07
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Expires: 1967-04-15
Abstract
No abstract record available.
Inventors
- 👤 Ericsson Erik Arvid
- 👤 Jacobaeus Anton Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/08; H04M11/00; H04M11/02; H04M11/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1963600A
Cited
US2199824A
Cited
US2330355A
Cited
US2330357A
Cited
US2335524A
Cited
US2397881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |