US540760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic air and vacuum valve
Assignee: —
•
Filing: —
•
Granted: 1895-06-11
•
Expires: 1912-06-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:45
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/08; F24D19/081; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/304; Y10T137/3046; Y10T137/3049; Y10T137/3084; Y10T137/3087; Y10T137/309; Y10T137/3099; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7722; Y10T137/7771; Y10T137/8593; Y10T137/87917
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1898-06-10 | 1898-12-10 | 1899-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1902-06-11 | 1902-12-11 | 1903-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1906-06-11 | 1906-12-11 | 1907-06-12 | $7700.00 | Window Closed / Lapsed |