Patent US4535249A successfully refreshed from Google Patents.
Patent US3287918A successfully refreshed from Google Patents.
US3287918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water level control device
Assignee: LOFTON JAMES JR P O BOX 344 GOULD ARK
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Filing: 1963-08-16
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Granted: 1966-11-29
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Expires: 1983-08-16
Abstract
No abstract record available.
Inventors
- 👤 Charles A Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:38
CPC Classifications
E; E02; E02B; E02B13/00; E02B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A DEVICE FOR CONTROLLING FLOW OF WATER BETWEEN ADJACENT RICE FIELDS COMPRISING A RIGID CHANNEL-SHAPED BODY HAVING OUTWARDLY PROJECTING FLANGE MEANS ADAPTED TO BE EMBEDDED IN THE SOIL IN A LEVEE BETWEEN THE ADJACENT FIELDS, WHEREBY TO DEFINE A WATER FLOW PASSAGE THROUGH THE LEVEE, THE SIDE WALLS OF THE BODY BEING FORMED WITH VERTICAL GROOVES, AND A RESILIENT PLATE MEMBER ARCUATELY CURVED VERTICALLY CONTINUOUSLY THROUGHOUT ITS HEIGHT AND HAVING ITS END EDGES FRICTIONALLY ENGAGED IN SAID VERTICAL GROOVES, SAID PLATE MEMBER DEFINING A CYLINDRICAL RESILIENT GATE CLOSURE FROM SIDE EDGE TO SIDE EDGE, EACH SIDE EDGE BEING BIASED AGAINST OPPOSITE WALLS OF ITS RESPECTIVE SEATING GROOVE FOR FRICTIONALLY-POSITIONING THE GATE CLOSURE RELATIVE TO THE BOTTOM OF THE CHANNEL-SHAPED BODY, THE PLATE MEMBER ACTING AS A FLOW-CONTROLLING GATE AND BEING MANUALLY VERTICALLY ADJUSTABLE IN SAID GROOVES.
Claim 2
Independent Claim
136 words
A DEVICE FOR CONTROLLING FLOW OF WATER BETWEEN ADJACENT RICE FIELDS COMPRISING A RIGID CHANNEL-SHAPED BODY HAVING OUTWARDLY PROJECTING FLANGE MEANS ADAPTED TO BE EMBEDDED IN THE SOIL IN A LEVEE BETWEEN THE ADJACENT FIELDS, WHEREBY TO DEFINE A WATER FLOW PASSAGE THROUGH THE LEVEE, THE SIDE WALLS OF THE BODY BEING FORMED WITH VERTICAL GROOVES, AND A RESILIENT PLATE MEMBER ARCUATELY CURVED VERTICALLY CONTINUOUSLY THROUGHOUT ITS HEIGHT AND HAVING ITS END EDGES FRICTIONALLY ENGAGED IN SAID VERTICAL GROOVES, SAID PLATE MEMBER DEFINING A CYLINDRICAL RESILIENT GATE CLOSURE FROM SIDE EDGE TO SIDE EDGE, EACH SIDE EDGE BEING BIASED AGAINST OPPOSITE WALLS OF ITS RESPECTIVE SEATING GROOVE FOR FRICTIONALLY-POSITIONING THE GATE CLOSURE RELATIVE TO THE BOTTOM OF THE CHANNEL-SHAPED BODY, THE PLATE MEMBER ACTING AS A FLOW-CONTROLLING GATE AND BEING MANUALLY VERTICALLY ADJUSTABLE IN SAID GROOVES.
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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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |