US2657542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid oxygen converter apparatus
Assignee: Individual
•
Filing: 1951-10-10
•
Granted: 1953-11-03
•
Expires: 1971-10-10
Abstract
No abstract record available.
Inventors
- 👤 William A Wildhack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:51
CPC Classifications
F; F17; F17C; F17C9/00; F17C9/02; A; A61; A61M; A61M16/00; A61M16/10; A61M2202/00; A61M2202/02; A61M2202/0208; A61M2202/03; F17C2201/00; F17C2201/01; F17C2201/0128; F17C2201/05; F17C2201/058; F17C2203/00; F17C2203/03; F17C2203/0391; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0332; F17C2221/00; F17C2221/01; F17C2221/011; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2225/00; F17C2225/01; F17C2225/0107; F17C2225/0123; F17C2227/00; F17C2227/03; F17C2227/0302; F17C2227/0367; F17C2227/0388; F17C2227/0393; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/313; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7796
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2252830A
Cited
US2576985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |