US2424841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of alkyl and alkylene naphthalene isomers
Assignee: Beazer East Inc
•
Filing: 1945-07-17
•
Granted: 1947-07-29
•
Expires: 1965-07-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Nickels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:18
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/56; C07C15/58; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0059; C07C15/20; C07C15/24; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
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) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |