Patent US4917115A successfully refreshed from Google Patents.
Patent US4598272A successfully refreshed from Google Patents.
Patent US4363323A successfully refreshed from Google Patents.
Patent FR1522869A successfully refreshed from Google Patents.
Patent US2428376A successfully refreshed from Google Patents.
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
2026-10-25 12:28
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2165924A
Cited
US2112951A
Cited
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 |