US2418831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric switch
Assignee: PHOTOSWITCH Inc
•
Filing: 1943-12-09
•
Granted: 1947-04-15
•
Expires: 1963-12-09
Abstract
No abstract record available.
Inventors
- 👤 James C Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:15
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01H37/5418
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1784450A
Cited
US1734095A
Cited
US1928802A
Cited
US1974188A
Cited
US2014958A
Cited
US1960020A
Cited
US2363280A
Cited
US2361162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-14 | 1950-10-14 | 1951-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-14 | 1954-10-14 | 1955-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-14 | 1958-10-14 | 1959-04-15 | $7700.00 | Window Closed / Lapsed |