US3857804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic film for controlling plant growth
Assignee: Montedison SpA
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Filing: 1969-07-07
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Granted: 1974-12-31
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Expires: 1989-07-07
Abstract
Abstract A thermoplastic film for controlling plant growth which has a total light transmittance to sunlight of less than 40% for light with a wavelength of 300 - 700 m Mu and a light transmittance greater than 60% for wavelengths above about 900 m Mu and preferably between 90 and 1,500 m Mu . The foil or film thickness may be 0.01 to 0.5 mm and the light transmittance characteristics thereof correspond to the following table:
Inventors
- 👤 F Glatti
- 👤 M Guariento
- 👤 U Cerruti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:36
CPC Classifications
A; A01; A01G; A01G13/00; A01G13/30; A01G13/32; A01G13/33; A01G9/00; A01G9/14; A01G9/1438; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25; Y10; Y10S; Y10S260/00; Y10S260/43; Y10S47/00; Y10S47/06; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
THE COMBINATION WITH AN AGRICULTURE GROWTH MEDIUM EXPOSED TO THE SUM OF A FLEXIBLE FILM OF SYNTHETIC THERMOPLASTIC MATERIAL INTERPOSED BETWEEN THE SUN AND THE AGRICULTURE GROWTH MEDIUM AND HAVING TOTAL LIGHT TRANSMITTANCE TO SUNLIGHT WITH A WAVELENGTH BETWEEN 3000 AND 700 MU OF LESS THAN 40% AND AVERAGE TOTAL LIGHT TRANSMITTANCE FOR SUNLIGHT WITH A WAVELENGTH GREATER THAN 900 MU OF AT LEAST 60% THE TOTAL TRANSMITTANCE OF THE FILM TO SUNLIGHT BETWEEN 900 AND 1500 MU BEING ON THE AVERAGE GREATER THAN 60% THE FLEXIBLE THIN HAVING A THICKNESS OF 0.10 TO 0.5 MM AND LIGHT TRANSMITTANCE CHARACTERISTICS FOR SUNLIGHT CORRESPONDING TO THE FOLLOWING TABLE;
Claim 2
Dependent Claim
107 words
THE COMBINATION WITH AN AGRICULTURE GROWTH MEDIUM EXPOSED TO THE SUM OF A FLEXIBLE FILM OF SYNTHETIC THERMOPLASTIC MATERIAL INTERPOSED BETWEEN THE SUN AND THE AGRICULTURE GROWTH MEDIUM AND HAVING TOTAL LIGHT TRANSMITTANCE TO SUNLIGHT WITH A WAVELENGTH BETWEEN 3000 AND 700 MU OF LESS THAN 40% AND AVERAGE TOTAL LIGHT TRANSMITTANCE FOR SUNLIGHT WITH A WAVELENGTH GREATER THAN 900 MU OF AT LEAST 60% THE TOTAL TRANSMITTANCE OF THE FILM TO SUNLIGHT BETWEEN 900 AND 1500 MU BEING ON THE AVERAGE GREATER THAN 60% THE FLEXIBLE THIN HAVING A THICKNESS OF 0.10 TO 0.5 MM AND LIGHT TRANSMITTANCE CHARACTERISTICS FOR SUNLIGHT CORRESPONDING TO THE FOLLOWING TABLE;
Claim 3
Independent Claim
46 words
A method of growing a plant in an agricultural plot comprising the step of causing a plant to grow through an opening provided in a flexible film having a thickness of 0.01 to 0.5 mm and light transmittance characteristics for sunlight corresponding to the following table:
Claim 4
Independent Claim
46 words
A method of growing a plant in an agricultural plot comprising the step of causing a plant to grow through an opening provided in a flexible film having a thickness of 0.01 to 0.5 mm and light transmittance characteristics for sunlight corresponding to the following table:
Claim 5
Dependent Claim
29 words
The combination defined in claim 1 wherein the film comprises a polymer and 1 to 10 parts by weight of a dyestuff per 100 parts by weight of polymer.
Claim 6
Dependent Claim
19 words
The combination defined in claim 3 wherein the polymer in said film consists at least predominantly of polyvinyl chloride.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |