US42721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in apparatus for inhaling gas
Assignee: —
•
Filing: —
•
Granted: 1864-05-10
•
Expires: 1881-05-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/06
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) | 1867-05-10 | 1867-11-09 | 1868-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-05-10 | 1871-11-09 | 1872-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-05-10 | 1875-11-09 | 1876-05-10 | $7700.00 | Window Closed / Lapsed |