US4481242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aquatic weed barrier
Assignee: DuPont Canada Inc
•
Filing: 1982-07-29
•
Granted: 1984-11-06
•
Expires: 2002-07-29
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 08:15
CPC Classifications
A; A01; A01M; A01M21/00; E; E02; E02B; E02B3/00; E02B3/04; E02B3/12; E02B3/122; E02B3/126; Y; Y10; Y10S; Y10S428/00; Y10S428/919; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24281; Y10T428/24298; Y10T428/24306; Y10T428/24314
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A film, of a thermoplastic synthetic polymer, having a plurality of vee-shaped incisions therein forming a triangular flap, the area of each such flap being between about 1 and 25 cm 2 , there being between about 36 incisions and 1 incision per square meter of film, said film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 2
Dependent Claim
66 words
A film, of a thermoplastic synthetic polymer, having a plurality of vee-shaped incisions therein forming a triangular flap, the area of each such flap being between about 1 and 25 cm 2 , there being between about 36 incisions and 1 incision per square meter of film, said film also having a light transmittance in the 200 to 650 nm wavelength range of less than 50%.
Claim 3
Dependent Claim
32 words
A film according to claim 1 wherein the thermoplastic synthetic polymer is selected from the group consisting of nylon, homopolymers and copolymers of C 2 -C 3 olefins, polyesters and polyvinyl chloride.
Claim 4
Dependent Claim
13 words
A film according to claim 2 wherein the thermoplastic synthetic polymer is nylon.
Claim 5
Dependent Claim
17 words
A film according to claim 3 wherein the nylon is cast nylon 6 or cast nylon 66.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |