US37500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in gas regulators and purifiers
Assignee: —
•
Filing: —
•
Granted: 1863-01-27
•
Expires: 1880-01-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:29
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
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) | 1866-01-26 | 1866-07-28 | 1867-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1870-01-26 | 1870-07-28 | 1871-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1874-01-26 | 1874-07-28 | 1875-01-27 | $7700.00 | Window Closed / Lapsed |