US844003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-pressure valve for drain-traps.
Assignee: Individual
•
Filing: 1906-04-20
•
Granted: 1907-02-12
•
Expires: 1926-04-20
Abstract
No abstract record available.
Inventors
- 👤 John F Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/04; E03F5/042; E03F7/00; E03F7/02; E03F7/04; B; B01; B01D; B01D2201/00; B01D2201/40; B01D2201/4046
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) | 1910-02-11 | 1910-08-13 | 1911-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-02-11 | 1914-08-13 | 1915-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-02-11 | 1918-08-13 | 1919-02-12 | $7700.00 | Window Closed / Lapsed |