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US1415261A Expired / Lapsed US ⏱️ 0.0 years remaining

Process of case hardening articles

Assignee: Individual
•
Filing: 1921-01-17
•
Granted: 1922-05-09
•
Expires: 1941-01-17
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Abstract

No abstract record available.

Inventors

  • 👤 George C Nixon
  • 👤 Raab Frederick Charles

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 18:09
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/64; C23C8/66; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/4948

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) 1925-05-08 1925-11-07 1926-05-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1929-05-08 1929-11-07 1930-05-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1933-05-08 1933-11-07 1934-05-09 $7700.00 Window Closed / Lapsed

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