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US1087981A Expired / Lapsed US ⏱️ 0.0 years remaining

Double flap check-valve.

Assignee: Individual
•
Filing: 1913-05-28
•
Granted: 1914-02-24
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Expires: 1933-05-28
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Abstract

No abstract record available.

Inventors

  • 👤 Howard W Reynolds

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 14:18
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/035; F16K15/036; F16K15/038; F16K15/033; Y; Y10; Y10S; Y10S261/00; Y10S261/49; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7898

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) 1917-02-23 1917-08-25 1918-02-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1921-02-23 1921-08-25 1922-02-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1925-02-23 1925-08-25 1926-02-24 $7700.00 Window Closed / Lapsed

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