US2775979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
-automatic drain valve for pipelines
Assignee: —
•
Filing: —
•
Granted: 1957-01-01
•
Expires: 1974-01-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:56
CPC Classifications
F; F16; F16K; F16K15/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7722; Y10T137/7837; Y10T137/7879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2561296A
Cited
GB191204227A
Cited
DE545646C
Cited
US1992495A
Cited
US2133575A
Cited
US2341758A
Cited
US2587961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |