US2739209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device at contact spring groups, especially for electromagnetic relays
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1953-06-17
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Granted: 1956-03-20
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Expires: 1973-06-17
Abstract
No abstract record available.
Inventors
- 👤 Palmgren Nils Gunnar
- 👤 Wiberg Eric Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:53
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54; H01H50/56; H01H50/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2515914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |