US2407640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone or like signaling system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1943-09-18
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Granted: 1946-09-17
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Expires: 1963-09-18
Abstract
No abstract record available.
Inventors
- 👤 Gillings Charles
- 👤 Beale Charles Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:57
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/02; C09B62/04; C09B62/08; D; D04; D04B; D04B1/00; D04B1/22; D04B1/24; D04B1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-09-16 | 1950-03-18 | 1950-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-16 | 1954-03-18 | 1954-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-16 | 1958-03-18 | 1958-09-17 | $7700.00 | Window Closed / Lapsed |