US2838634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for limiting excess currents in direct or alternating currents mains
Assignee: Fkg Fritz Kesselring Geratebau AG
•
Filing: 1954-03-09
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Granted: 1958-06-10
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Expires: 1974-03-09
Abstract
No abstract record available.
Inventors
- 👤 Kesselring Fritz
- 👤 Zurich Zollikon
- 👤 Baer Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/14; H01H71/20; H01H71/1045; H01H9/00; H01H9/10; H01H9/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1159547A
Cited
US1211967A
Cited
US1294621A
Cited
US1833173A
Cited
US1930485A
Cited
US1850213A
Cited
US2255470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |