Patent US725028A successfully refreshed from Google Patents.
US725028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary engine.
Assignee: Individual
•
Filing: 1900-11-05
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Granted: 1903-04-14
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Expires: 1920-11-05
Abstract
No abstract record available.
Inventors
- 👤 Jacob Heinrich Ludwig Boettcher
- 👤 Johann Detlef Adolf Boettcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:13
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/36; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/14; F01C1/20
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) | 1906-04-13 | 1906-10-13 | 1907-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-04-13 | 1910-10-13 | 1911-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-04-13 | 1914-10-13 | 1915-04-14 | $7700.00 | Window Closed / Lapsed |