US2639130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for equalizing distribution in packed columns
Assignee: Individual
•
Filing: 1948-11-27
•
Granted: 1953-05-19
•
Expires: 1968-11-27
Abstract
No abstract record available.
Inventors
- 👤 Peter N Heere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:23
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/008; B01J; B01J19/00; B01J19/30; B01J19/305; B01J2219/00; B01J2219/30; B01J2219/302; B01J2219/30223; Y; Y10; Y10S; Y10S261/00; Y10S261/72
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) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |