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Patent US2443756A successfully refreshed from Google Patents.
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US2443756A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnetic material

Assignee: Brush Development Co
•
Filing: 1942-12-26
•
Granted: 1948-06-22
•
Expires: 1962-12-26
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Abstract

No abstract record available.

Inventors

  • 👤 Alfred L W Williams
  • 👤 Begun Semi Joseph

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 17:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; Y; Y10; Y10S; Y10S205/00; Y10S205/922; Y10S29/00; Y10S29/028; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/938; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291

Claims Analysis

Total Claims: 0
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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) 1951-06-22 1951-12-22 1952-06-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1955-06-22 1955-12-22 1956-06-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1959-06-22 1959-12-22 1960-06-22 $7700.00 Window Closed / Lapsed

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