Patent US3677576A successfully refreshed from Google Patents.
US3677576A
Expired / Lapsed
US
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Roof flange with elastomeric collar
Assignee: GUSTAFSON CRAIG S JR WALTHAM MA ALL CO-PARTNERS D/B/U ARFCO COMPANY 10 MANNING ROAD BILLERICA MA 01821
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Filing: 1970-08-05
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Granted: 1972-07-18
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Expires: 1990-08-05
Abstract
Abstract Roof flanges with elastomeric collars having improved sealing characteristics. With the collar belling gradually from its opening, defining a convex surface engaging the pipe over a substantial distance, a liquid-tight seal results despite variations in the size or surface of the pipe. A pre-applied lubricant on the sealing surface enables attachment of high pressure collars while improving sealing.
Inventors
- 👤 Craig S Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:16
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/14; E04D13/147; E04D13/1471
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
The roof flange unit of claim 1 wherein said wall has a total effective sealing length, beginning at said opening, in the range of about one inch, the angle of said wall relative to a plane radial to said axis of said collar varying gradually from substantially 90* at said opening to less than 45* at a point most remote from said opening.
Claim 2
Dependent Claim
50 words
The roof flange of claim 2 wherein said bell-shaped wall is integrally joined at its point most remote from said opening with a resilient attachment bead of substantially greater thickness than said wall, said collar comprising neoprene rubber, and a metal flange member permanently crimped about said resilient attachment bead.
Claim 3
Dependent Claim
49 words
The roof flange unit of claim 1 wherein said collar is formed of neoprene rubber and the wall thickness of said collar at said opening is on the order of 0.100 inch, the thickness of said wall decreasing gradually downwardly over a distance on the order of one-fourth inch.
Claim 4
Dependent Claim
62 words
The roof flange unit of claim 1 wherein said collar comprises neoprene rubber of a wall thickness in the range of between 0.100 inch and 0.050 inch, the diameter of said opening being on the order of one inch less than the corresponding standard pipe outer diameter, and a coating of pre-applied water-resistant lubricant disposed on said convex surface of said collar.
Claim 5
Dependent Claim
38 words
The roof flange unit of claim 1 wherein a coating of pre-applied water-resistant lubricant is disposed on the surface of said collar adapted to engage said pipe said pre-applied lubricant comprises a thin coating of silicon lubricant-waterproofing agent.
References Cited (Backward Citations)
US3098663A
Cited
US3313559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |