US3506068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumpable impeller pistons for flow conductors
Assignee: Otis Engineering Corp
•
Filing: 1967-04-20
•
Granted: 1970-04-14
•
Expires: 1987-04-20
Abstract
No abstract record available.
Inventors
- 👤 Norman F Brown
- 👤 John V Fredd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B23/00; E21B23/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2061993A
Cited
US2334788A
Cited
US2578818A
Cited
US2860356A
Cited
US3052302A
Cited
US3312282A
Cited
US3318605A
Cited
US3346045A
Cited
US3373820A
Cited
US3419074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |