US2615092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discriminating service telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-03-05
•
Granted: 1952-10-21
•
Expires: 1967-03-05
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Lomax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:41
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1934402A
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US1963929A
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US2217041A
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US2214908A
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US2276731A
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US2367769A
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US2427000A
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US2374964A
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US2471087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |