US2876292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching apparatus and arrangements for automatic telephone systems
Assignee: North Electric Co
•
Filing: 1952-03-22
•
Granted: 1959-03-03
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
- 👤 Jack E Callender
- 👤 Gerald E Bosler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:28
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54; H01H50/56; H01H50/58; H04; H04Q; H04Q3/00; H04Q3/0008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1075007A
Cited
US1189891A
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GB302107A
Cited
US2137514A
Cited
US2137503A
Cited
US2416131A
Cited
US2519849A
Cited
US2472428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |