US2158657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching apparatus
Assignee: Individual
•
Filing: 1936-09-14
•
Granted: 1939-05-16
•
Expires: 1956-09-14
Abstract
No abstract record available.
Inventors
- 👤 William H Frank
- 👤 Lawrence E Fisher
- 👤 Joseph A Messing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:59
CPC Classifications
H; H01; H01H; H01H21/00; H01H21/02; H01H21/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1942-05-15 | 1942-11-14 | 1943-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-15 | 1946-11-14 | 1947-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-15 | 1950-11-14 | 1951-05-16 | $7700.00 | Window Closed / Lapsed |