US1554720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric-arc device
Assignee: General Electric Co
•
Filing: 1918-12-03
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Granted: 1925-09-22
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Expires: 1938-12-03
Abstract
No abstract record available.
Inventors
- 👤 Charles V Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/125; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/50; H01J17/52; H01J17/58; H01J19/00; H01J19/02; H01J21/00; H01J21/02; H01J21/06; H01J21/16; H01J61/24; H01J61/26; H01J7/00; H01J7/14; H01J7/18; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H01J2893/00; H01J2893/0001
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) | 1928-09-21 | 1929-03-23 | 1929-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-09-21 | 1933-03-23 | 1933-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-09-21 | 1937-03-23 | 1937-09-22 | $7700.00 | Window Closed / Lapsed |