Patent US672712A successfully refreshed from Google Patents.
US672712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System of electrodynamic propulsion.
Assignee: Individual
•
Filing: 1900-01-31
•
Granted: 1901-04-23
•
Expires: 1920-01-31
Abstract
No abstract record available.
Inventors
- 👤 Leon Rosenfeld
- 👤 Constantin Zelenay
- 👤 Julien Dulait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
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) | 1904-04-22 | 1904-10-22 | 1905-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1908-04-22 | 1908-10-22 | 1909-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1912-04-22 | 1912-10-22 | 1913-04-23 | $7700.00 | Window Closed / Lapsed |