US2897656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-fractionating system
Assignee: US Philips Corp
•
Filing: 1955-10-27
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Granted: 1959-08-04
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Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 Ster Johannes Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:58
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905; Y10S62/906
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |