US3007006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system
Assignee: North Electric Co
•
Filing: 1956-01-27
•
Granted: 1961-10-31
•
Expires: 1976-01-27
Abstract
No abstract record available.
Inventors
- 👤 Jack E Callender
- 👤 Robert H Slemmer
- 👤 Kare K Spjeldnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:59
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733297A
Cited
US2268019A
Cited
US2490036A
Cited
US2585904A
Cited
US2711444A
Cited
US2741664A
Cited
US2813929A
Cited
US2761900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |