US2764877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for liquefying air
Assignee: Hartford National Bank and Trust Co
•
Filing: 1951-03-23
•
Granted: 1956-10-02
•
Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Kohler Jacob Willem Laurens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:26
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0203; F25J1/0208; F25J1/0002; F25J1/0012; F25J1/003; F25J1/0032; F25J1/004; F25J3/00; F25J3/02; F25J3/04; F25J2270/00; F25J2270/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |