Patent US189737A successfully refreshed from Google Patents.
US189737A
Expired / Lapsed
US
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Improvement in shades for try-squares
Assignee: —
•
Filing: —
•
Granted: 1877-04-17
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Expires: 1894-04-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:52
CPC Classifications
B; B43; B43L; B43L7/00; B43L7/10; B43L7/12; Y; Y10; Y10S; Y10S33/00; Y10S33/16
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) | 1880-04-16 | 1880-10-16 | 1881-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1884-04-16 | 1884-10-16 | 1885-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1888-04-16 | 1888-10-16 | 1889-04-17 | $7700.00 | Window Closed / Lapsed |