US4012867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Growth of plants
Assignee: BP PLC
•
Filing: 1976-04-08
•
Granted: 1977-03-22
•
Expires: 1996-04-08
Abstract
Abstract A greenhouse cloche etc comprising an outer light transmitting wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide and gas admitting means for introducing carbon dioxide gas into the space between the inner and outer walls.
Inventors
- 👤 David Lindsay Guy Lainchbury
- 👤 John Edward Preedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
A; A01; A01G; A01G9/00; A01G9/18; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24661
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
43 words
A closed structure for enclosing plants which comprises an outer light transmitting wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide and gas-admitting means for introducing between the inner and outer walls, carbon dioxide gas.
Claim 2
Dependent Claim
43 words
A closed structure for enclosing plants which comprises an outer light transmitting wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide and gas-admitting means for introducing between the inner and outer walls, carbon dioxide gas.
Claim 3
Dependent Claim
17 words
A closed structure according to claim 1 which is sufficiently large to allow human beings to enter.
Claim 4
Dependent Claim
28 words
A device according to claim 1 made of sheets of flexible material joined together so as to be capable of inflation by gas introduced through the gas-admitting means.
Claim 5
Dependent Claim
13 words
A device according to claim 3 wherein connections are provided between opposed walls.
Claim 6
Dependent Claim
50 words
A device according to claim 1 wherein the opposed walls are constituted from sheets of the same light transmitting flexible plastics material which has a low permeability to carbon dioxide, the permeability of one wall to carbon dioxide being increased by pores formed mechanically in the sheet forming that wall.
Claim 7
Dependent Claim
44 words
A device according to claim 1 wherein one wall is formed from a flexible plastics sheet material which has a low permeability to carbon dioxide and the opposed wall from a flexible plastics sheet material which inherently has a higher permeability to carbon dioxide.
Claim 8
Dependent Claim
37 words
A device according to claim 6 wherein the wall which is relatively permeable to carbon dioxide is from 50 to 1,000 times more permeable to carbon dioxide than the wall which is relatively impermeable to carbon dioxide.
Claim 9
Dependent Claim
41 words
A device according to claim 6 wherein the permeability of the wall which is relatively impermeable to carbon dioxide is less than 9 × 10.sup. -10 kg/m 2 /sec under the conditions under to which the wall is subjected in use.
Claim 10
Dependent Claim
30 words
A device according to claim 8 wherein the wall which is relatively impermeable to carbon dioxide is made of polyvinyl chloride having a thickness between 25 μm and 250 μm.
Claim 11
Dependent Claim
32 words
A device according to claim 6 wherein the wall which is relatively permeable to carbon dioxide is made from oriented low density polyethylene having a thickness between 12 μm and 125 μm.
Claim 12
Dependent Claim
55 words
A light transmitting closed panel suitable for use in the production of a closed plant protecting structure, one wall of the panel being relatively impermeable to carbon dioxide and the opposed wall of the panel being relatively permeable to carbon dioxide, the panel having gas-admitting means for introducing between the two walls, carbon dioxide gas.
Claim 13
Dependent Claim
55 words
A light transmitting closed panel suitable for use in the production of a closed plant protecting structure, one wall of the panel being relatively impermeable to carbon dioxide and the opposed wall of the panel being relatively permeable to carbon dioxide, the panel having gas-admitting means for introducing between the two walls, carbon dioxide gas.
Claim 14
Dependent Claim
28 words
A device according to claim 11 made of sheets of flexible material joined together so as to be capable of inflation by gas introduced through the gas-admitting means.
Claim 15
Dependent Claim
13 words
A device according to claim 12 wherein connections are provided between opposed walls.
Claim 16
Dependent Claim
44 words
A device according to claim 11 wherein one wall is formed from a flexible plastics sheet material which has a low permeability to carbon dioxide and the opposed wall from a flexible plastics sheet material which inherently has a higher permeability to carbon dioxide.
Claim 17
Dependent Claim
37 words
A device according to claim 11 wherein the wall which is relatively permeable to carbon dioxide is from 50 to 1,000 times more permeable to carbon dioxide than the wall which is relatively impermeable to carbon dioxide.
Claim 18
Dependent Claim
40 words
A device according to claim 14 wherein the permeability of the wall which is relatively impermeable to carbon dioxide is less than 9 × 10.sup. -10 kg/m 2 /sec under the conditions under which the wall is subjected in use.
Claim 19
Dependent Claim
30 words
A device according to claim 14 wherein the wall which is relatively impermeable to carbon dioxide is made of polyvinyl chloride having a thickness between 25 μm and 250 μm.
Claim 20
Dependent Claim
32 words
A device according to claim 14 wherein the wall which is relatively permeable to carbon dioxide is made from oriented low density polyethylene having a thickness between 12 μm and 125 μm.
Claim 21
Independent Claim
65 words
A method for promoting the growth of plants which comprises (a) growing the plants within a closed plant-enclosing structure having a light transmitting outer wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide, the inner and outer walls being spaced apart to enclose a closed gas space and (b) feeding carbon dioxide into the closed gas space.
Claim 22
Independent Claim
65 words
A method for promoting the growth of plants which comprises (a) growing the plants within a closed plant-enclosing structure having a light transmitting outer wall relatively impermeable to carbon dioxide and an inner light transmitting wall relatively permeable to carbon dioxide, the inner and outer walls being spaced apart to enclose a closed gas space and (b) feeding carbon dioxide into the closed gas space.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |