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US2691121A
Expired / Lapsed
US
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Circuit-arrangement for energizing relays
Assignee: Hartford National Bank and Trust Co
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Filing: 1952-03-01
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Granted: 1954-10-05
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Expires: 1972-03-01
Abstract
No abstract record available.
Inventors
- 👤 Buchner Robert Bertold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:46
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |