US2428376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time controlled register for automatic telephone systems
Assignee: AT&T Inc
•
Filing: 1943-06-12
•
Granted: 1947-10-07
•
Expires: 1963-06-12
Abstract
No abstract record available.
Inventors
- 👤 William H Matthies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:08
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2165924A
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US2112951A
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US2112375A
Cited
US2316238A
Cited
GB516415A
Cited
US2214809A
Cited
US2291496A
Cited
US2351551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |