Irrigation gravel guard
US4057968A · kind A · utility
Inventor
Key dates
| Filing date | Sep 12, 1974 |
| Grant date | Nov 15, 1977 |
| Priority date | — |
| Expiry date | Sep 12, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02B13/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An irrigation gravel guard is disclosed comprising a ring shaped support having a substantially conical shaped screen means secured thereto and extending therefrom. One end of the screen means is open and is secured to the ring shaped support by welding or the like. The other end of the screen means is rolled or crimped upon itself to substantially close the other end thereof except for the perforations extending therethrough. An extension screen for use with the gravel guard is also disclosed and comprises a pair of spaced apart ring shaped supports having a truncated conical shaped screen means secured thereto and extending therebetween. The extension may be welded to the end of the gravel guard so as to effectively increase the over-all length thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.