US2964913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of air
Assignee: Airco Inc
•
Filing: 1956-12-31
•
Granted: 1960-12-20
•
Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Donald L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:05
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04187; F25J3/04218; F25J3/04224; F25J3/04248; F25J3/04278; F25J2270/00; F25J2270/12; F25J2270/14; F25J2270/42; F25J2270/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2146197A
Cited
US2423273A
Cited
US2417279A
Cited
US2496380A
Cited
US2499043A
Cited
US2627731A
Cited
US2708831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |