Patent US243759A successfully refreshed from Google Patents.
Patent US4056936A successfully refreshed from Google Patents.
US4056936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benthic semi-barrier to control the growth of weeds in aquatic environments
Assignee: Individual
•
Filing: 1976-04-13
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Granted: 1977-11-08
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Expires: 1996-04-13
Abstract
Abstract A screen of foraminous material is laid directly on the surface of shallow water beds where weed growth is likely or is occurring. The screen is non-reactive to the surrounding water and creates a physical semi-barrier to rootlet and stem formation and to the transmission of light to the area therebetween to thereby retard germination and growth of weeds but not to stop growth entirely. The screen is formed with sufficient openings so that the normal movement of the surrounding water is not materially affected.
Inventors
- 👤 J. Richard Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:19
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/122; E02B3/126
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
An ecologically harmless method of limiting weed growth in selected areas of the bottom of a body of water comprising the steps of: placing a noncorrosive foraminous screen, having a plurality of generally uniform apertures, on an area to be treated upon existant plant life and in a co-planar relationship with the bottom of the body of water; maintaining said noncorrosive foraminous screen in close proximity and co-planar relationship with the bottom of the body of water; inhibiting plant growth in the area beneath said noncorrosive foraminous screen by, shielding said area from a substantial degree of the sun's rays with said noncorrosive foraminous screen; and limiting plant size in an area beneath and through said noncorrosive foraminous screen by, limiting the size of plant stems which extend through the foraminous screen to the size of the apertures in said noncorrosive foraminous screen.
Claim 2
Dependent Claim
143 words
An ecologically harmless method of limiting weed growth in selected areas of the bottom of a body of water comprising the steps of: placing a noncorrosive foraminous screen, having a plurality of generally uniform apertures, on an area to be treated upon existant plant life and in a co-planar relationship with the bottom of the body of water; maintaining said noncorrosive foraminous screen in close proximity and co-planar relationship with the bottom of the body of water; inhibiting plant growth in the area beneath said noncorrosive foraminous screen by, shielding said area from a substantial degree of the sun's rays with said noncorrosive foraminous screen; and limiting plant size in an area beneath and through said noncorrosive foraminous screen by, limiting the size of plant stems which extend through the foraminous screen to the size of the apertures in said noncorrosive foraminous screen.
Claim 3
Dependent Claim
62 words
An ecologically harmless method of limiting weed growth in selected areas of the bottom of a body of water as defined in claim 1 wherein: said step of placing comprises placing a noncorrosive foraminous screen in position in close proximity with the bottom of the body of water wherein said foraminous screen has a porosity comprising approximately 400 apertures per square inch.
References Cited (Backward Citations)
US1382069A
Cited
FR55819E
Cited
US3151463A
Cited
US3830066A
Cited
DE2131647A1
Cited
US3844123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |