US137713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in the manufacture of gas
Assignee: —
•
Filing: —
•
Granted: 1873-04-08
•
Expires: 1890-04-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52
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) | 1876-04-07 | 1876-10-07 | 1877-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1880-04-07 | 1880-10-07 | 1881-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1884-04-07 | 1884-10-07 | 1885-04-08 | $7700.00 | Window Closed / Lapsed |