US3007008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system
Assignee: North Electric Co
•
Filing: 1955-07-15
•
Granted: 1961-10-31
•
Expires: 1975-07-15
Abstract
No abstract record available.
Inventors
- 👤 Kare K Spjeldnes
- 👤 Jack E Callender
- 👤 Robert H Slemmer
- 👤 William H Blashfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:07
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1863376A
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US1886296A
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US2572027A
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US2582959A
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US2541362A
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US2585904A
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US2674657A
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US2731514A
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US2761012A
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 |