US967820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-seat valve.
Assignee: Individual
•
Filing: 1909-12-03
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Granted: 1910-08-16
•
Expires: 1929-12-03
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Nachtigall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:20
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/46; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/18; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86767; Y10T137/86928; Y10T137/87016; Y10T137/87265
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) | 1913-08-15 | 1914-02-14 | 1914-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1917-08-15 | 1918-02-14 | 1918-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1921-08-15 | 1922-02-14 | 1922-08-16 | $7700.00 | Window Closed / Lapsed |