US3863936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature gasket structure and method of producing same
Assignee: FD FARNAM Inc
•
Filing: 1973-03-27
•
Granted: 1975-02-04
•
Expires: 1993-03-27
Abstract
Abstract A high temperature gasket structure particularly useful in automotive carburetors but useful in other applications in which the gasket body is formed from a special type of semi-rigid asbestos board having a minimal elastomeric binder content, and with the bolt hole areas densified in part by embedded steel washers in the gasket body to minimize carburetor flange flexing and maintain high torque retention under heat. The gasket structure is intended to serve as a heat insulator and as a partial sound and vibration dampener and can be formed, when required, with upstanding beads to further minimize flexing of the carburetor flange while maintaining a seal.
Inventors
- 👤 Robert G Farnam
- 👤 Michael T Passarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:20
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; F16J15/123
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
27 words
A high tEmperature gasket as set forth in claim 1 wherein said body portion has a density within the range of about 75 to about 90 lb/ft3.
Claim 2
Dependent Claim
27 words
A high temperature gasket as set forth in claim 2 wherein said bolt hole portion has a density within the range of about 120 to 175 lb/ft3.
Claim 3
Dependent Claim
40 words
A high temperature gasket as set forth in claim 1 wherein said gasket is coined in said bolt hole portion whereby the level of the densified area is disposed flush with at least one surface of the gasket body portion.
Claim 4
Dependent Claim
39 words
A high temperature gasket as set forth in claim 1 wherein said gasket is coined in said bolt hole portion whereby the level of the densified area is disposed above at least one surface of the gasket body portion.
Claim 5
Dependent Claim
39 words
A high temperature gasket as set forth in claim 1 wherein said gasket is coined in said bolt hole portion whereby the level of the densified area is disposed below at least one surface of the gasket body portion.
Claim 6
Dependent Claim
40 words
A high temperature gasket as set forth in claim 1 in which the gasket also includes an integral bead formed on at least one surface of the gasket and having a density less than that of the adjoining body portion.
Claim 7
Dependent Claim
34 words
A high temperature gasket as set forth in claim 7 in which the densified bolt hole portion extends above the level of the adjoining body portion but below the level of said raised bead.
Claim 8
Dependent Claim
20 words
A high temperature gasket as set forth in claim 7 in which said bead overlies said densified bolt hole portion.
Claim 9
Dependent Claim
40 words
A high temperature gasket as set forth in claim 1 in which said bolt hole portion is coined to a depth not more than about 0.015 inches below the surface of the adjacent body portion on at least one side.
Claim 10
Dependent Claim
38 words
A high temperature gasket as set forth in claim 1 in which the body portion has a density of about 75 to 95 lb/ft3 and the bolt hole portion has a density of about 110 to 140 lb/ft3.
Claim 11
Dependent Claim
46 words
A high temperature gasket as set forth in claim 1 in which a metal washer is embedded on both faces of the gasket structure concentric with said bolt hole portion, and in which the semi-rigid asbestos board between said washers is compacted to said higher density.
Claim 12
Dependent Claim
30 words
A high temperature gasket as set forth in claim 12 in which said body portion of the gasket has applied to at least one side asbestos reinforced elastomeric packing material.
Claim 13
Dependent Claim
41 words
A high temperature gasket as set forth in claim 1 wherein one or more surfaces of said body portion are covered with a high temperature, anti-scuff coating having a thickness in the range of about 0.0003 inches to about 0.0005 inches.
Claim 14
Dependent Claim
29 words
A high temperature gasket as set forth in claim 1 wherein the elastomeric binder content is in the range of about 5 percent to about 15 percent by weight.
Claim 15
Dependent Claim
30 words
A high temperature gasket as set forth in claim 1 in which said board is composed of asbestos fiber having a fiber length between approximately 0.187 inches and 0.040 inches.
Claim 16
Dependent Claim
32 words
A high temperature gasket as set forth in claim 16 in which the asbestos fibers are oriented in the relationship of about 1.3 to 1.0 in length to width of the board.
Claim 17
Dependent Claim
26 words
A high temperature gasket as set forth in claim 1 in which said gasket is characterized by high performance in torque retention, namely over 50 percent.
References Cited (Backward Citations)
US2395243A
Cited
US3202033A
Cited
US3462161A
Cited
US3606357A
Cited
US3679218A
Cited
US3661401A
Cited
US3664676A
Cited
US3794333A
Cited
US3811689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |