Patent US3471081A successfully refreshed from Google Patents.
US3471081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid feed pipe
Assignee: Ametek Inc
•
Filing: 1967-12-21
•
Granted: 1969-10-07
•
Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frank O'conor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:29
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/12; B04B1/00; B04B1/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2685369A
Cited
US3326457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |