US2603956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of and apparatus for the purification of air
Assignee: Linde GmbH
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Filing: 1950-05-02
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Granted: 1952-07-22
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Expires: 1970-05-02
Abstract
No abstract record available.
Inventors
- 👤 Borchardt Philipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:12
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |