US1632080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge device
Assignee: AT&T Inc
•
Filing: 1921-12-27
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Granted: 1927-06-14
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Expires: 1941-12-27
Abstract
No abstract record available.
Inventors
- 👤 Johnson John Bertrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
A; A01; A01J; A01J9/00; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; H01J29/46; H01J29/48; H01J29/485
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) | 1930-06-13 | 1930-12-13 | 1931-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-06-13 | 1934-12-13 | 1935-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-06-13 | 1938-12-13 | 1939-06-14 | $7700.00 | Window Closed / Lapsed |