Patent US4081374A successfully refreshed from Google Patents.
US4081374A
Expired / Lapsed
US
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Balance control water screen
Assignee: Individual
•
Filing: 1977-09-28
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Granted: 1978-03-28
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Expires: 1997-09-28
Abstract
Abstract Disclosed herein is an improved balance control water screen wherein the linkage associated with the balanced waste door is contained within the walled trough structure so as to provide a minimum number of linkage elements. Further improvements relate to a single walled construction and a simplified water sealing arrangement so that the water control screen is more efficient and economical.
Inventors
- 👤 Edward Forshee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
An improved balance control water screen wherein the improvement comprises a pair of shrouds each of which are disposed on the inner faces of opposed vertical walls, screw members riding within said shrouds, said screw members being provided with flange members at their top extent to retard vertical displacement at any desired point, said screw members are connected to a door remote from said flanges and said door is pivotally disposed about a rod which is mounted through water retarding bearings on said vertical walls.
Claim 2
Dependent Claim
85 words
An improved balance control water screen wherein the improvement comprises a pair of shrouds each of which are disposed on the inner faces of opposed vertical walls, screw members riding within said shrouds, said screw members being provided with flange members at their top extent to retard vertical displacement at any desired point, said screw members are connected to a door remote from said flanges and said door is pivotally disposed about a rod which is mounted through water retarding bearings on said vertical walls.
References Cited (Backward Citations)
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US2309472A
Cited
US3355022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |