US3940540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-slip built-up roofing
Assignee: Chevron USA Inc
•
Filing: 1971-01-04
•
Granted: 1976-02-24
•
Expires: 1991-01-04
Abstract
Abstract Built-up roofing employing precoated felts are inhibited from slipping by the use of bituminous emulsions to bind the felts. A minor amount of a compatible latex is incorporated into the emulsion to increase the adhesion of the bonded felts.
Inventors
- 👤 Robert J. Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:01
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; E; E04; E04D; E04D11/00; E04D11/02; B32B2255/00; B32B2255/02; B32B2309/00; B32B2309/14; B32B2419/00; B32B2419/06; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/31815; Y10T442/00; Y10T442/50; Y10T442/51; Y10T442/54; Y10T442/59
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
In a built-up roof using at least two layers of asphalt-precoated felts in layers, the improvement comprised of said layers bound together by at least one binding layer of the residuum of an aqueous latex modified bituminous emulsion, in which (1) the weight ratio of the latex solids to bitumen is in the range of from 1:2.0-30 and (2) said binding layer has a thickness of from about 0.002 to about 0.01 inch.
Claim 2
Dependent Claim
73 words
In a built-up roof using at least two layers of asphalt-precoated felts in layers, the improvement comprised of said layers bound together by at least one binding layer of the residuum of an aqueous latex modified bituminous emulsion, in which (1) the weight ratio of the latex solids to bitumen is in the range of from 1:2.0-30 and (2) said binding layer has a thickness of from about 0.002 to about 0.01 inch.
Claim 3
Dependent Claim
11 words
Claim 1 wherein said ratio is in the range of 1:4.0-10.
Claim 4
Dependent Claim
17 words
Claim 2 wherein said binding layer has a thickness of from about 0.003 to about 0.006 inch.
Claim 5
Dependent Claim
17 words
Claim 3 wherein said ratio of the said latex solids to said bitumen is 1 to 6.
Claim 6
Dependent Claim
17 words
Claim 1 wherein said binding layer has a thickness of from about 0.003 to about 0.006 inch.
Claim 7
Dependent Claim
122 words
In a process for preparing built-up roofing employing at least two asphalt-precoated felts the improvement comprised of: I. applying to the surfaces of said felts a modified bituminous emulsion at a rate of from 0.2 to 1.0 gallon per 100 square feet of surface, said modified bituminous emulsion comprised of (1) from 70 to 90 parts by weight of a bituminous emulsion having a residuum of from 40 to 70 percent by weight and (2) from 30 to 10 parts by weight of a latex having a solids content of from 20 to 70 percent by weight with the proviso that said modified bituminous emulsion has 100 total parts by weight, and Ii. contacting said felt sheets to bind said felts together.
Claim 8
Dependent Claim
122 words
In a process for preparing built-up roofing employing at least two asphalt-precoated felts the improvement comprised of: I. applying to the surfaces of said felts a modified bituminous emulsion at a rate of from 0.2 to 1.0 gallon per 100 square feet of surface, said modified bituminous emulsion comprised of (1) from 70 to 90 parts by weight of a bituminous emulsion having a residuum of from 40 to 70 percent by weight and (2) from 30 to 10 parts by weight of a latex having a solids content of from 20 to 70 percent by weight with the proviso that said modified bituminous emulsion has 100 total parts by weight, and Ii. contacting said felt sheets to bind said felts together.
Claim 9
Dependent Claim
19 words
Claim 6 wherein said rate of application is from 0.3 to 0.6 gallon per 100 square feet of surface.
Claim 10
Dependent Claim
16 words
Claim 6 wherein said emulsion has a residuum of from 50 to 65 percent by weight.
Claim 11
Dependent Claim
18 words
Claim 8 wherein said latex has an elastomeric solids content of from 30 to 55 percent by weight.
Claim 12
Dependent Claim
11 words
Claim 9 wherein the bitumen in said bituminous emulsion is asphalt.
Claim 13
Dependent Claim
17 words
Claim 10 wherein said rate is from 0.3 to 0.6 gallon per 100 square feet of surface.
Claim 14
Dependent Claim
15 words
Claim 11 wherein the elastomer in said latex is a copolymer of styrene and butadiene.
Claim 15
Dependent Claim
10 words
Claim 11 wherein said bituminous emulsion is cationic in nature.
Claim 16
Dependent Claim
10 words
Claim 11 wherein said bituminous emulsion is anionic in nature.
References Cited (Backward Citations)
US2288293A
Cited
US2323336A
Cited
US2326723A
Cited
US2757711A
Cited
US2863405A
Cited
US2976256A
Cited
US2933469A
Cited
US3027342A
Cited
US3094447A
Cited
US3111787A
Cited
US3128261A
Cited
US3407083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |