US370551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of cleaning the surfaces of stone
Assignee: —
•
Filing: —
•
Granted: 1887-09-27
•
Expires: 1904-09-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:20
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C11; C11D; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/22
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) | 1890-09-26 | 1891-03-28 | 1891-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1894-09-26 | 1895-03-28 | 1895-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1898-09-26 | 1899-03-28 | 1899-09-27 | $7700.00 | Window Closed / Lapsed |