Patent US3076416A successfully refreshed from Google Patents.
US3076416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple production pump
Assignee: Individual
•
Filing: 1960-09-22
•
Granted: 1963-02-05
•
Expires: 1980-09-22
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:38
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PUMP, WELL TUBING; A PUMP BARREL MOUNTED IN AND SPACED FROM SAID TUBING TO DEFINE THEREBETWEEN AN ANNULAR FLUID CHAMBER; A PARTITION CLOSING THE UPPER END OF SAID BARREL; MEANS PROVIDING IN SAID BARREL A FLUID INTAKE CHAMBER HAVING A NORMALLY CLOSED INLET; SEPARATE PUMP CHAMBERS IN SAID BARREL ABOVE SAID INTAKE CHAMBER; PARTITIONS IN SAID BARREL DEFINING THE LOWER ENDS OF SAID PUMP CHAMBERS; SAID LAST-NAMED PARTITIONS HAVING CONSTANTLY OPEN PASSAGES LEADING FROM SAID ANNULAR FLUID CHAMBER INTO THE LOWER ENDS OF SAID PUMP CHAMBERS; A
Claim 2
Dependent Claim
89 words
IN A PUMP, WELL TUBING; A PUMP BARREL MOUNTED IN AND SPACED FROM SAID TUBING TO DEFINE THEREBETWEEN AN ANNULAR FLUID CHAMBER; A PARTITION CLOSING THE UPPER END OF SAID BARREL; MEANS PROVIDING IN SAID BARREL A FLUID INTAKE CHAMBER HAVING A NORMALLY CLOSED INLET; SEPARATE PUMP CHAMBERS IN SAID BARREL ABOVE SAID INTAKE CHAMBER; PARTITIONS IN SAID BARREL DEFINING THE LOWER ENDS OF SAID PUMP CHAMBERS; SAID LAST-NAMED PARTITIONS HAVING CONSTANTLY OPEN PASSAGES LEADING FROM SAID ANNULAR FLUID CHAMBER INTO THE LOWER ENDS OF SAID PUMP CHAMBERS; A
References Cited (Backward Citations)
US1435837A
Cited
US1567827A
Cited
US1683435A
Cited
US1761355A
Cited
US1879178A
Cited
US1870137A
Cited
US2227122A
Cited
US2255305A
Cited
US2284505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |