US647239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator.
Assignee: Sprague Electric Co
•
Filing: 1898-07-27
•
Granted: 1900-04-10
•
Expires: 1918-07-27
Abstract
No abstract record available.
Inventors
- 👤 Frank J Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:49
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/54; B23Q5/56; F; F16; F16H; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H1/16; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19047
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) | 1903-04-10 | 1903-10-10 | 1904-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-04-10 | 1907-10-10 | 1908-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-04-10 | 1911-10-10 | 1912-04-10 | $7700.00 | Window Closed / Lapsed |