Patent US1381897A successfully refreshed from Google Patents.
US1381897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ackley
Assignee: —
•
Filing: —
•
Granted: 1921-06-21
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Expires: 1938-06-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:46
CPC Classifications
F; F02; F02M; F02M29/00; F02M29/02; F02M33/00; F02M33/02; Y; Y10; Y10S; Y10S261/00; Y10S261/55; Y10S55/00; Y10S55/28; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/3024; Y10T137/3028; Y10T137/304; Y10T137/3052; Y10T137/3068; Y10T137/7287; Y10T137/7358; Y10T137/7365; Y10T137/7439; Y10T137/7475
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) | 1924-06-20 | 1924-12-20 | 1925-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-06-20 | 1928-12-20 | 1929-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-06-20 | 1932-12-20 | 1933-06-21 | $7700.00 | Window Closed / Lapsed |