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US2676210A
Expired / Lapsed
US
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Potential comparing selector circuit
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-07-28
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Granted: 1954-04-20
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Expires: 1969-07-28
Abstract
No abstract record available.
Inventors
- 👤 Oberman Roelof Maarten Marie
- 👤 Buchner Robert Bertold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:47
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22794E
Cited
US2354682A
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GB583574A
Cited
US2492943A
Cited
US2470240A
Cited
US2454781A
Cited
US2462074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |