Patent US74781A successfully refreshed from Google Patents.
US74781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in permutation-looks
Assignee: —
•
Filing: —
•
Granted: 1868-02-25
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Expires: 1885-02-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:54
CPC Classifications
E; E05; E05B; E05B37/00; E05B37/08; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7153; Y10T70/7181; Y10T70/7198; Y10T70/7237; Y10T70/7243; Y10T70/80; Y10T70/8297
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) | 1871-02-24 | 1871-08-26 | 1872-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1875-02-24 | 1875-08-26 | 1876-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1879-02-24 | 1879-08-26 | 1880-02-25 | $7700.00 | Window Closed / Lapsed |