US2542079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counting-relay selector and switching system
Assignee: Individual
•
Filing: 1947-05-22
•
Granted: 1951-02-20
•
Expires: 1967-05-22
Abstract
No abstract record available.
Inventors
- 👤 Grundin Ivan Vitalis
- 👤 Erlandsson Erik Gunnar Valfrid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H01; H01H; H01H67/00; H01H67/22; H01H67/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2019320A
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US2136630A
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US2260810A
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US2297092A
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US2340554A
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |