Patent US2397157A successfully refreshed from Google Patents.
Patent US2123642A successfully refreshed from Google Patents.
Patent US3439595A successfully refreshed from Google Patents.
Patent US4274209A successfully refreshed from Google Patents.
Patent US2030933A successfully refreshed from Google Patents.
US2030933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet switch
Assignee: Penn Electric Switch Co
•
Filing: 1933-10-16
•
Granted: 1936-02-18
•
Expires: 1953-10-16
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Persons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:41
CPC Classifications
H; H01; H01H; H01H5/00; H01H5/02
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) | 1939-02-17 | 1939-08-19 | 1940-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-17 | 1943-08-19 | 1944-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-17 | 1947-08-19 | 1948-02-18 | $7700.00 | Window Closed / Lapsed |