US2973189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionating columns
Assignee: Individual
•
Filing: 1956-02-28
•
Granted: 1961-02-28
•
Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Chu Ju Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:56
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0053; B01J19/006; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/22; B01J10/00; B01J10/002; B01J2219/00; B01J2219/00761; B01J2219/00763; B01J2219/00765; B01J2219/00777; B01J2219/18; B01J2219/185; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1943
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2072382A
Cited
US2374950A
Cited
US2564078A
Cited
US2570215A
Cited
US2627397A
Cited
US2658737A
Cited
US2698746A
Cited
US2718900A
Cited
US2747849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |