US1836829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge device
Assignee: AT&T Inc
•
Filing: 1928-04-17
•
Granted: 1931-12-15
•
Expires: 1948-04-17
Abstract
No abstract record available.
Inventors
- 👤 Howard W Weinhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/485; H01J29/86; H01J29/861
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) | 1934-12-14 | 1935-06-15 | 1935-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-14 | 1939-06-15 | 1939-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-14 | 1943-06-15 | 1943-12-15 | $7700.00 | Window Closed / Lapsed |