US2661608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pumping liquefied gases containing nitrogen
Assignee: Air Products Inc
•
Filing: 1948-05-15
•
Granted: 1953-12-08
•
Expires: 1968-05-15
Abstract
No abstract record available.
Inventors
- 👤 Frank E Pavlis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:21
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F17; F17C; F17C9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE495795C
Cited
US1976388A
Cited
GB500544A
Cited
US2292375A
Cited
US2480094A
Cited
US2480093A
Cited
US2464891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |