US3380809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for liquefaction and conversion of hydrogen
Assignee: Air Products and Chemicals Inc
•
Filing: 1963-10-16
•
Granted: 1968-04-30
•
Expires: 1983-10-16
Abstract
No abstract record available.
Inventors
- 👤 Charles L Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:48
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/002; F25B9/004; C; C01; C01B; C01B3/00; C01B3/0089; F25J; F25J1/00; F25J1/0002; F25J1/0005; F25J1/001; F25J1/003; F25J1/0032; F25J1/0035; F25J1/0037; F25J1/004; F25J1/0045; F25J1/0047; F25J1/005; F25J1/0052; F25J1/006; F25J1/007; F25J1/0072; F25J1/02; F25J1/0203; F25J1/0208; F25J1/0243; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/0265; F25J2205/00; F25J2205/02; F25J2205/04; F25J2220/00; F25J2220/02; F25J2245/00; F25J2245/90
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |