Patent US1215957A successfully refreshed from Google Patents.
US1215957A
Expired / Lapsed
US
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Apparatus for liquefying and separating gases.
Assignee: Individual
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Filing: 1915-10-07
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Granted: 1917-02-13
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Expires: 1935-10-07
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Mewes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:24
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1920-02-13 | 1920-08-14 | 1921-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-02-13 | 1924-08-14 | 1925-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-02-13 | 1928-08-14 | 1929-02-13 | $7700.00 | Window Closed / Lapsed |