US1257470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the liquefaction and rectification of air.
Assignee: Koninklijke Philips NV
•
Filing: 1916-06-03
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Granted: 1918-02-26
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Expires: 1936-06-03
Abstract
No abstract record available.
Inventors
- 👤 Hendrik Filippo
- 👤 Pancras Schoonenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:46
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04
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) | 1921-02-25 | 1921-08-27 | 1922-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-02-25 | 1925-08-27 | 1926-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-02-25 | 1929-08-27 | 1930-02-26 | $7700.00 | Window Closed / Lapsed |