Patent US2587014A successfully refreshed from Google Patents.
US2587014A
Expired / Lapsed
US
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Charge and tax determining equipment for telephone systems
Assignee: AT&T Inc
•
Filing: 1948-12-29
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Granted: 1952-02-26
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Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 Vroom Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2099754A
Cited
US2255147A
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US2332304A
Cited
GB578077A
Cited
US2288520A
Cited
US2385007A
Cited
US2477722A
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US2434500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |