Patent DE411698C successfully refreshed from Google Patents.
US2640332A
Expired / Lapsed
US
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Oxygen producing apparatus
Assignee: Arthur D Little Inc
•
Filing: 1946-08-10
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Granted: 1953-06-02
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Expires: 1966-08-10
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:31
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; Y; Y10; Y10S; Y10S417/00; Y10S417/901; Y10S62/00; Y10S62/902; Y10S62/908; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7809; Y10T137/781; Y10T137/7837; Y10T137/7847; Y10T137/7848; Y10T137/7904; Y10T137/7922; Y10T137/7927
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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |