US2221867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for intermittently operating electrical load devices
Assignee: Individual
•
Filing: 1938-03-24
•
Granted: 1940-11-19
•
Expires: 1958-03-24
Abstract
No abstract record available.
Inventors
- 👤 Feingold Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/34; H03; H03K; H03K17/00; H03K17/28; H03K17/288; H05; H05C; H05C1/00; H05C1/04
Claims Analysis
Total Claims: 0
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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) | 1943-11-19 | 1944-05-20 | 1944-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-19 | 1948-05-20 | 1948-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-19 | 1952-05-20 | 1952-11-19 | $7700.00 | Window Closed / Lapsed |