Patent US3520800A successfully refreshed from Google Patents.
US3520800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying hydrogen gas effluent from a catalytic reforming process
Assignee: Universal Oil Products Co
•
Filing: 1968-09-30
•
Granted: 1970-07-14
•
Expires: 1988-09-30
Abstract
No abstract record available.
Inventors
- 👤 James T Forbes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:11
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2985583A
Cited
US2931768A
Cited
US3296118A
Cited
US3402122A
Cited
US3425931A
Cited
US3431195A
Cited
US3470084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |