Patent US1996181A successfully refreshed from Google Patents.
Patent US4876950A successfully refreshed from Google Patents.
US4876950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ventilator
Assignee: Individual
•
Filing: 1988-04-18
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Granted: 1989-10-31
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Expires: 2008-04-18
Abstract
Abstract The roof ventilator includes a membrane of closed cell plastic so that it is rendered impervious to moisture and a pair of laterally-spaced open cell plastic strips adhesively secured to one side of the membrane, the strips being of foamed polyurethane. Specifically, the strips have a multiplicity of intercommunicating cells or pores so that when installed air can readily flow outwardly through the interconnected cells of the strips, yet inward migration of moisture is inhibited by reason of the many interlinked filaments or strands that form the various cells. The roof ventilator can be attched to a conventional roof by means of nails or an adhesive.
Inventors
- 👤 Richard D. Rudeen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:07
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/17; E04D13/174; F; F24; F24F; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
44 words
A roof ventilator section comprising an impervious flexible plastic membrane constituting a flat sheet conformable to different roof pitches, and a pair of laterally-spaced open cell foamed plastic strips secured to one side of said membrane, said strips having a multiplicity of interlinked filaments.
Claim 2
Dependent Claim
44 words
A roof ventilator section comprising an impervious flexible plastic membrane constituting a flat sheet conformable to different roof pitches, and a pair of laterally-spaced open cell foamed plastic strips secured to one side of said membrane, said strips having a multiplicity of interlinked filaments.
Claim 3
Dependent Claim
24 words
A roof ventilator section in accordance with claim 1 in which the open cells constitutes about 95% of the cross section of said strips.
Claim 4
Dependent Claim
30 words
A roof ventilator section in accordance with claim 1 in which said plastic membrane has a thickness on the order of 3/16 inch and is of closed cell foamed polypropylene.
Claim 5
Dependent Claim
41 words
A roof ventilator section in accordance with claim 3 in which said membrane has a density on the order of three pounds per cubic foot and the density of said strips is on the order of 1.75 pounds per cubic foot.
Claim 6
Dependent Claim
27 words
A roof ventilator section in accordance with claim 4 in which said plastic strips are of foamed polyurethane having a thickness on the order of 7/8 inch.
Claim 7
Dependent Claim
160 words
In combination, a sloping roof having a vent opening therein, a plurality of ventilator sections secured to said roof, each ventilator section including an impervious flexible plastic membrane, the flexibility of said membrane allowing said membrane to conform readily to the pitch of the sloping roof, and an open cell foamed plastic strip having its upper side secured to the underside of said membrane and its lower side secured to said roof, said strip having a multiplicity of interlinked filaments or strands that are quite slender or skeletal as far as their cross section is concerned to provide a myriad of interconnecting cells or pores so that airflow through each ventilator section can occur only through its open cell strip and in a direction generally parallel to the portion of said membrane overlying said strip and the portion of said roof underlying said strip, whereby moisture collects on the various filaments or strands instead of passing through said vent opening.
Claim 8
Dependent Claim
160 words
In combination, a sloping roof having a vent opening therein, a plurality of ventilator sections secured to said roof, each ventilator section including an impervious flexible plastic membrane, the flexibility of said membrane allowing said membrane to conform readily to the pitch of the sloping roof, and an open cell foamed plastic strip having its upper side secured to the underside of said membrane and its lower side secured to said roof, said strip having a multiplicity of interlinked filaments or strands that are quite slender or skeletal as far as their cross section is concerned to provide a myriad of interconnecting cells or pores so that airflow through each ventilator section can occur only through its open cell strip and in a direction generally parallel to the portion of said membrane overlying said strip and the portion of said roof underlying said strip, whereby moisture collects on the various filaments or strands instead of passing through said vent opening.
Claim 9
Dependent Claim
103 words
In combination, a roof having a vent opening therein, a plurality of ventilator sections secured to said roof, each ventilator section including an impervious membrane and a pair of laterally-spaced open cell foamed plastic strips having their upper sides secured to the underside of said membrane and their lower sides secured to said roof, said strip having a multiplicity of interlinked filaments or strands that are quite slender or skeletal as far as their cross section is concerned to provide a myriad of interconnecting cells or pores, whereby moisture collects on the various filaments or strands instead of passing through said vent opening.
Claim 10
Dependent Claim
103 words
In combination, a roof having a vent opening therein, a plurality of ventilator sections secured to said roof, each ventilator section including an impervious membrane and a pair of laterally-spaced open cell foamed plastic strips having their upper sides secured to the underside of said membrane and their lower sides secured to said roof, said strip having a multiplicity of interlinked filaments or strands that are quite slender or skeletal as far as their cross section is concerned to provide a myriad of interconnecting cells or pores, whereby moisture collects on the various filaments or strands instead of passing through said vent opening.
Claim 11
Dependent Claim
15 words
The combination of claim 8 in which said ventilator sections are nailed to said roof.
Claim 12
Dependent Claim
16 words
The combination of claim 8 in which said ventilator sections are adhesively secured to said roof.
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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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |