Patent EP0528039A1 successfully refreshed from Google Patents.
US2641653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ringer circuit using cold cathode tube
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1950-04-05
•
Granted: 1953-06-09
•
Expires: 1970-04-05
Abstract
No abstract record available.
Inventors
- 👤 Harold C Pye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
H; H04; H04Q; H04Q5/00; H04Q5/02; H04Q5/06; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1024463A
Cited
US1788103A
Cited
US1864645A
Cited
US2053605A
Cited
US2069915A
Cited
US2168909A
Cited
US2180334A
Cited
US2249154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |