US4039706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated bituminous roofing membrane
Assignee: Tajima Roofing Inc
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Filing: 1975-05-08
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Granted: 1977-08-02
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Expires: 1995-05-08
Abstract
Abstract A novel self-adhesive type multi-layer laminated bituminous roofing membrane suitable for the formation of the roofing or waterproofing layer on roofs, floors and the like is provided. It comprises a base sheet of a sheet-like material, one or more bitumen layers coated on all or part of one or both faces of the base sheet, at least one layer of compound bitumen including both bitumen and rubber and/or resin laminated on all or part of the surface of said bitumen-coated layer on the base sheet and at least one release sheet laid over the whole surface of said compound bitumen layer. This roofing membrane is produced by uniting the bitumen-coated base sheet and the compound bitumen-coated release sheet, and can be applied over a substrate in a simple manner, without the step of melting or liquefying bitumen as in the conventional application process.
Inventors
- 👤 Eiichi Tajima
- 👤 Kaname Yamamoto
- 👤 Takayoshi Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/24; E; E04; E04D; E04D5/00; E04D5/10; E06; E06B; E06B1/00; E06B1/62; E06B2001/628; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/14; Y10T428/141; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/2443; Y10T428/24446; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727; Y10T428/24802; Y10T428/24851; Y10T428/2486; Y10T428/24917; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31678; Y10T428/31717; Y10T428/31815
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
210 words
A self-adhesive, multi-layer, laminated, bituminous roofing membrane, comprising a flexible base sheet having superposed on the entirety of at least one surface thereof a first coating layer of uniform thickness applied in direct face-to-face, mutually adhering contact therewith, said first coating layer consisting essentially of a substantially solid, waterproofing roofing bitumen; a second coating layer of uniform thickness superposed on said first layer and having its inner surface in direct, face-to-face, mutually cohering contact with the outer surface of said first coating layer, said second coating layer being of lesser thickness than said first coating layer and consisting essentially of a compound bitumen, said compound bitumen consisting essentially of roofing bitumen containing from about 5 to 95 percent by weight of substance selected from the group consisting of rubber, thermoplastic resin and mixtures thereof, said compound bitumen being of high tackiness at ambient temperature and being self-adhesive to the second coating layer of another like roofing membrane; and a flexible release sheet having a release substance in direct face-to-face releasably adhering contact with the entire outer surface of said second coating layer, said release sheet being an exposed outer layer of said roofing membrane, said second layer having been adhered in a molten state to said first surface coating layer.
Claim 2
Dependent Claim
210 words
A self-adhesive, multi-layer, laminated, bituminous roofing membrane, comprising a flexible base sheet having superposed on the entirety of at least one surface thereof a first coating layer of uniform thickness applied in direct face-to-face, mutually adhering contact therewith, said first coating layer consisting essentially of a substantially solid, waterproofing roofing bitumen; a second coating layer of uniform thickness superposed on said first layer and having its inner surface in direct, face-to-face, mutually cohering contact with the outer surface of said first coating layer, said second coating layer being of lesser thickness than said first coating layer and consisting essentially of a compound bitumen, said compound bitumen consisting essentially of roofing bitumen containing from about 5 to 95 percent by weight of substance selected from the group consisting of rubber, thermoplastic resin and mixtures thereof, said compound bitumen being of high tackiness at ambient temperature and being self-adhesive to the second coating layer of another like roofing membrane; and a flexible release sheet having a release substance in direct face-to-face releasably adhering contact with the entire outer surface of said second coating layer, said release sheet being an exposed outer layer of said roofing membrane, said second layer having been adhered in a molten state to said first surface coating layer.
Claim 3
Dependent Claim
22 words
A roofing membrane as claimed in claim 1, wherein said base sheet consists essentially of fibrous material completely impregnated with roofing bitumen.
Claim 4
Dependent Claim
14 words
A roofing membrane as claimed in claim 1 in the form of a coil.
Claim 5
Dependent Claim
43 words
A roofing membrane as claimed in claim 1 in which said base sheet has said first coating layers applied on the entireties of both surfaces thereof and said second coating layers are applied on the entireties of both of said first coating layers.
Claim 6
Dependent Claim
60 words
A roofing membrane as claimed in claim 1 in which said base sheet has said first coating layers applied on the entireties of both surfaces thereof and the entirety of one of said first coating layers is covered by a layer of mineral aggregate and the entirety of the other first coating layer is covered by said second coating layer.
Claim 7
Dependent Claim
72 words
A roofing membrane as claim in claim 1 in which said base sheet has said first coating layers applied on the entireties of both surfaces thereof and a portion of one of said first coating layers is covered by a synthetic polymer film or a metal foil, and the remainder of said one first coating layer and the entirety of said other first coating layer are covered by said second coating layers.
Claim 8
Dependent Claim
35 words
A roofing membrane as claimed in claim 1 in which said first coating layer has a thickness of 2 to 3 mm and said second coating layer has a thickness of 0.3 to 0.5 mm.
Claim 9
Dependent Claim
22 words
A roofing membrane as claimed in claim 1, wherein said base sheet is a film of synthetic polymer or a metal foil.
Claim 10
Dependent Claim
55 words
A roofing membrane as claimed in claim 1, wherein said rubber in said compound bitumen is a vulcanized or non-vulcanized rubber selected from the group consisting of natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butadiene rubber, isoprene rubber, butyl rubber, ethylene-propylene rubber, ethylene-propylene diene mar, polyisobutylene, chlorinated polyethylene, mixtures thereof, and reclaimed rubbers thereof.
Claim 11
Dependent Claim
38 words
A roofing membrane as claimed in claim 9, wherein said resin in the compound bitumen is natural or synthetic resin selected from the group consisting of rosin and its derivatives, tall oil, cumarone-indene resin, petroleum resin, and polyolefin.
Claim 12
Dependent Claim
26 words
A roofing membrane as claimed in claim 10, wherein said compound bitumen further contains up to 50 weight percent animal or vegetable oil, fat or derivatives.
Claim 13
Dependent Claim
34 words
A roofing membrane as claimed in claim 1, wherein said release sheet is coated with a resin having high releasing property selected from the group consisting of silicone resin, fluorine-containing resin or polyvinylidene chloride.
Claim 14
Dependent Claim
19 words
A roofing membrane as claimed in claim 12, wherein said release sheet is cellophane, polyvinylalcohol film or aluminum foil.
Claim 15
Dependent Claim
24 words
A roofing membrane as claimed in claim 1, wherein said release sheet has a corrugated or creped form so as to be longitudinally extensible.
Claim 16
Dependent Claim
37 words
A roofing membrane as claimed in claim 1, wherein said release sheet is provided with single or plural rows of perforations or notches, or cut lines along the lengthwise direction of the multi-layer laminated bituminous roofing membrane.
Claim 17
Dependent Claim
114 words
A roofing membrane as claimed in claim 1, consisting essentially of: said base sheet; two of said first coating layers completely covering the opposite surfaces of said base sheet, respectively; two of said second coating layers completely covering said outer surfaces of said first coating layers, respectively; and two of said release sheets completely covering said outer surfaces of said second coating layers, respectively; said base sheet consisting essentially of a thin flexible fibrous sheet impregnated with roofing bitumen; and said release sheets being coated or impregnated with a synthetic resin having a high releasing property to said second coating layers, said release sheets being corrugated or creped so as to be longitudinally extensible.
Claim 18
Dependent Claim
127 words
A roofing membrane as claimed in claim 1, consisting essentially of: said base sheet; two of said first coating layers completely covering the opposite surfaces of said base sheet, respectively; one second coating layer completely covering said outer surface of one of said first coating layers; one release sheet completely covering said outer surface of said second coating layer; a layer of mineral aggregate completely covering said outer surface of the other of said first coating layers; said base sheet consisting essentially of a thin flexible fibrous sheet impregnated with roofing bitumen; and said release sheet being coated or impregnated with a synthetic resin having a high releasing property to said second coating layer, said release sheet being corrugated or creped so as to be longitudinally extensible.
References Cited (Backward Citations)
US2326724A
Cited
US2392239A
Cited
US3111787A
Cited
US3128261A
Cited
US3468092A
Cited
US3940540A
Cited
US3770559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |