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US2644021A Expired / Lapsed US ⏱️ 0.0 years remaining

Internal-combustion engine

Assignee: Individual
•
Filing: 1946-03-07
•
Granted: 1953-06-30
•
Expires: 1966-03-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

No abstract record available.

Inventors

  • 👤 Hittell John Lindsay

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 19:15
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/04; F02M61/08; F02B; F02B75/00; F02B75/26; F02D; F02D1/00; F02D7/00; F02D7/002; F02M55/00; F02M59/00; F02M59/02; F02M59/10; F02M59/105; F02M59/12; F02M59/14; F02D2700/00; F02D2700/02; F02D2700/0269; F02D2700/0282; F02D2700/0284; F02D2700/0287; F02M2700/00; F02M2700/07; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336

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) 1956-06-29 1956-12-29 1957-06-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1960-06-29 1960-12-29 1961-06-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1964-06-29 1964-12-29 1965-06-30 $7700.00 Window Closed / Lapsed

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