US3358781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slotted plastic well screen with backwash valve and method of installation
Assignee: Individual
•
Filing: 1965-01-27
•
Granted: 1967-12-19
•
Expires: 1985-01-27
Abstract
No abstract record available.
Inventors
- 👤 William R Cotton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:53
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A WELL STRAINER COMPRISING IN COMBINATION, AN INTEGRAL PIPE HAVING SLOTS CUT THEREIN, SAID SLOTS BEING CUT IN A SERIES AND BEING DISPOSED CIRCUMFERENTIALLY OF THE PIPE AND ALONG A PLANE PERPENDICULAR TO THE AXIS OF SAID PIPE, AND BACKWASH VALVE, SAID BACKWASH VALVE COMPRISING A THREADED NUT MEMBER, SAID BACKWASH VALVE BEING CONNECTGED TO THE BOTTOM OF SAID WELL STRAINER, SAID THREADED NUT MEMBER HAVING THREADS ON THE OUTER CIRCUMFERENCE THEREOF, AND WHEREIN SAID BACKWARD VALVE INCLUDES AN ANNULAR ADAPTER HAVING THREADS ON THE INNER PERIPHERY THEREOF WHEREBY SAID THREADED NUT MEMBER MAY BE
Claim 2
Dependent Claim
95 words
A WELL STRAINER COMPRISING IN COMBINATION, AN INTEGRAL PIPE HAVING SLOTS CUT THEREIN, SAID SLOTS BEING CUT IN A SERIES AND BEING DISPOSED CIRCUMFERENTIALLY OF THE PIPE AND ALONG A PLANE PERPENDICULAR TO THE AXIS OF SAID PIPE, AND BACKWASH VALVE, SAID BACKWASH VALVE COMPRISING A THREADED NUT MEMBER, SAID BACKWASH VALVE BEING CONNECTGED TO THE BOTTOM OF SAID WELL STRAINER, SAID THREADED NUT MEMBER HAVING THREADS ON THE OUTER CIRCUMFERENCE THEREOF, AND WHEREIN SAID BACKWARD VALVE INCLUDES AN ANNULAR ADAPTER HAVING THREADS ON THE INNER PERIPHERY THEREOF WHEREBY SAID THREADED NUT MEMBER MAY BE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |