Patent US2533677A successfully refreshed from Google Patents.
US2533677A
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US
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Electronic device for timing toll calls and for signaling both subscriber and operator
Assignee: Automatic Electric Laboratories Inc
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Filing: 1945-09-15
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Granted: 1950-12-12
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Expires: 1965-09-15
Abstract
No abstract record available.
Inventors
- 👤 Harold J Mccreary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:23
CPC Classifications
H; H04; H04M; H04M15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1670303A
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US1726982A
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US1719474A
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US1825723A
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US1953474A
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US1917884A
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US2338218A
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US2362425A
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US2400085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |