US2520834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialing and for dial telephones
Assignee: Individual
•
Filing: 1949-09-19
•
Granted: 1950-08-29
•
Expires: 1969-09-19
Abstract
No abstract record available.
Inventors
- 👤 Crawford Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:50
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/23; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3916; Y10T24/3924; Y10T24/3987
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US227055A
Cited
US673658A
Cited
US897565A
Cited
US1336859A
Cited
US1694429A
Cited
US1725610A
Cited
US1794233A
Cited
US2245375A
Cited
US2314354A
Cited
US2371051A
Cited
US2428135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |