Patent US668957A successfully refreshed from Google Patents.
US668957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blackboard-ruler.
Assignee: Individual
•
Filing: 1900-05-24
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Granted: 1901-02-26
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Expires: 1920-05-24
Abstract
No abstract record available.
Inventors
- 👤 William Hugh Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:03
CPC Classifications
B; B43; B43L; B43L9/00; B43L9/007; B25; B25H; B25H7/00; B25H7/04
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) | 1904-02-26 | 1904-08-27 | 1905-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1908-02-26 | 1908-08-27 | 1909-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1912-02-26 | 1912-08-27 | 1913-02-26 | $7700.00 | Window Closed / Lapsed |