US2509913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric power source
Assignee: AT&T Inc
•
Filing: 1944-12-14
•
Granted: 1950-05-30
•
Expires: 1964-12-14
Abstract
No abstract record available.
Inventors
- 👤 Espenschied Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:33
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/002; B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; F23Q2/00; F23Q2/28; F23Q2/285; F23Q2/287
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |