US4518280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aquatic weed barrier
Assignee: DuPont Canada Inc
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Filing: 1984-04-25
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Granted: 1985-05-21
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Expires: 2004-04-25
Abstract
Abstract An aquatic weed barrier is disclosed which comprises a film having a plurality of incisions therein. Each incision is shaped to form at least one flap adjacent the incision. The film has a light transmittance of less than 50% in the 200 to 650 nm wavelength range.
Inventors
- 👤 Eldon L. Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:15
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/122; E02B3/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A method for substantially preventing growth of aquatic weeds comprising laying a film of synthetic thermoplastic polymer onto the bed of a water body, said film having a plurality of incisions therein, each incision being shaped to form at least one flap of film adjacent the incision, such film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 2
Independent Claim
66 words
A method for substantially preventing growth of aquatic weeds comprising laying a film of synthetic thermoplastic polymer onto the bed of a water body, said film having a plurality of incisions therein, each incision being shaped to form at least one flap of film adjacent the incision, such film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 3
Dependent Claim
52 words
A method according to claim 1 wherein each incision in the film is shaped such that the flaps adjacent each incision have an area of between about 1 and about 25 cm 2 , and in which weeds are rooted in the water bed and the film is laid over the weeds.
Claim 4
Dependent Claim
21 words
A method according to claim 2 wherein there are between about 36 incisions and 1 incision per square meter of film.
Claim 5
Dependent Claim
11 words
A method according to claim 3 wherein each incision is vee-shaped.
Claim 6
Dependent Claim
13 words
A method according to claim 3 wherein the thermoplastic synethtic polymer is nylon.
Claim 7
Dependent Claim
19 words
A method according to claim 5 wherein the nylon film is cast nylon 6 or cast nylon 66 film.
Claim 8
Independent Claim
84 words
A method for substantially preventing growth of aquatic weeds comprising laying a cast nylon film onto the bed of a water body, said nylon film having a thickness of between about 25 and 250 μm, containing between about 0.2 to 2.0% carbon black, and having a plurality of incisions therein, each incision being shaped to form at least one flap of film adjacent the incision, such film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 9
Independent Claim
84 words
A method for substantially preventing growth of aquatic weeds comprising laying a cast nylon film onto the bed of a water body, said nylon film having a thickness of between about 25 and 250 μm, containing between about 0.2 to 2.0% carbon black, and having a plurality of incisions therein, each incision being shaped to form at least one flap of film adjacent the incision, such film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 10
Dependent Claim
34 words
A method according to claim 7 wherein each incision in the film is shaped such that the flaps adjacent each incision have an area of between about 1 and about 25 cm 2 .
Claim 11
Dependent Claim
21 words
A method according to claim 8 wherein there are between about 36 incisions and 1 incision per square meter of film.
Claim 12
Dependent Claim
11 words
A method according to claim 9 wherein each incision is vee-shaped.
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |