Patent US3423323A successfully refreshed from Google Patents.
US3423323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning olefin separation equipment
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1964-11-16
•
Granted: 1969-01-21
•
Expires: 1984-11-16
Abstract
No abstract record available.
Inventors
- 👤 Edward Allen Hunter
- 👤 Warren Alfred Knarr
- 👤 Gerald Albert Byars
- 👤 David George Skamenca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:00
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/261; C11D7/32; C11D7/3218; C11D7/50; C11D7/5004; C11D7/5013; C11D7/264
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |