US38499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in apparatus for mixing gases
Assignee: —
•
Filing: —
•
Granted: 1863-05-12
•
Expires: 1880-05-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:13
CPC Classifications
F; F02; F02M; F02M21/00; F02M21/02; F02M21/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2516
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) | 1866-05-11 | 1866-11-10 | 1867-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1870-05-11 | 1870-11-10 | 1871-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1874-05-11 | 1874-11-10 | 1875-05-12 | $7700.00 | Window Closed / Lapsed |