US2438897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of plating contact surfaces of magnetic reeds
Assignee: AT&T Inc
•
Filing: 1943-08-26
•
Granted: 1948-04-06
•
Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 John T L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:04
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0201
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US542986A
Cited
US602212A
Cited
US645786A
Cited
US874374A
Cited
US887539A
Cited
US891361A
Cited
US1527095A
Cited
US1727736A
Cited
DE451623C
Cited
US2236647A
Cited
US2044431A
Cited
US2044415A
Cited
US2149344A
Cited
US2249765A
Cited
US2289830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |