US2534478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purifying method and apparatus
Assignee: Elliott Co
•
Filing: 1947-03-31
•
Granted: 1950-12-19
•
Expires: 1967-03-31
Abstract
No abstract record available.
Inventors
- 👤 Roberts Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:41
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04406; F25J3/04412; F25J3/04151; F25J3/04242; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/04333; F25J3/04351; F25J3/04357; F25J3/044; F25J2200/00; F25J2200/50; F25J2200/52; F25J2200/54; F25J2200/76; F25J2205/00; F25J2205/24; F25J2205/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2113680A
Cited
US2239883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |