Patent US2697134A successfully refreshed from Google Patents.
US2697134A
Expired / Lapsed
US
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Toll switching system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1950-08-25
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Granted: 1954-12-14
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Expires: 1970-08-25
Abstract
No abstract record available.
Inventors
- 👤 Harvey W Balzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:17
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/60
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |