US3420181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping system
Assignee: Individual
•
Filing: 1966-12-12
•
Granted: 1969-01-07
•
Expires: 1986-12-12
Abstract
No abstract record available.
Inventors
- 👤 Norman Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:19
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/04; F04D9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US452308A
Cited
US988225A
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US2080624A
Cited
US2652181A
Cited
US2682225A
Cited
US2654434A
Cited
US2674189A
Cited
US3013665A
Cited
US3212450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |