Patent US2615092A successfully refreshed from Google Patents.
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 22:12
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1934402A
Cited
US1963929A
Cited
US2217041A
Cited
US2214908A
Cited
US2276731A
Cited
US2367769A
Cited
US2385720A
Cited
US2427000A
Cited
US2374964A
Cited
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 |