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Patent US2469635A successfully refreshed from Google Patents.
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US2469635A Expired / Lapsed US ⏱️ 0.0 years remaining

Steam boiler or the like having extended heat transfer surfaces

Assignee: Svenska Maskinverken AB
•
Filing: 1948-10-06
•
Granted: 1949-05-10
•
Expires: 1968-10-06
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

No abstract record available.

Inventors

  • 👤 Dalin David
  • 👤 Gustav V Hagby

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 22:02
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28F1/405; F22; F22B; F22B29/00; F22B29/02; F22D; F22D1/00; F22D1/02; Y; Y10; Y10S; Y10S122/00; Y10S122/01

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) 1952-05-09 1952-11-08 1953-05-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1956-05-09 1956-11-08 1957-05-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1960-05-09 1960-11-08 1961-05-10 $7700.00 Window Closed / Lapsed

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