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US2034786A Expired / Lapsed US ⏱️ 0.0 years remaining

Check valve

Assignee: Individual
•
Filing: 1934-06-28
•
Granted: 1936-03-24
•
Expires: 1954-06-28
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Abstract

No abstract record available.

Inventors

  • 👤 Walter E Wilcox

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 17:24
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/042; Y; Y10; Y10T; Y10T137/00; Y10T137/7504; Y10T137/7613; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7912

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1939-03-24 1939-09-23 1940-03-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1943-03-24 1943-09-23 1944-03-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1947-03-24 1947-09-23 1948-03-24 $7700.00 Window Closed / Lapsed

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