Patent US4499135A successfully refreshed from Google Patents.
US4499135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaskets
Assignee: Payez International Ltd
•
Filing: 1982-12-06
•
Granted: 1985-02-12
•
Expires: 2002-12-06
Abstract
Abstract A paper-based gasket is impregnated with a silicone resin to improve resistance to water/antifreeze mixtures. The gasket is made from paper essentially free from amine-containing material such as wetting agent and is bonded with a sulphur-free or sulphur donor free rubber binder.
Inventors
- 👤 Barclay Mitchell
- 👤 Kenneth Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:26
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/31504; Y10T428/31652; Y10T428/31656; Y10T428/31659; Y10T428/31663; Y10T428/31826; Y10T428/31841; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
32 words
A gasket impregnated with a cured silicone resin manufactured from paper which is essentially free from amine containing material and which is bonded with a sulphur-free or sulphur donor free rubber binder.
Claim 2
Dependent Claim
32 words
A gasket impregnated with a cured silicone resin manufactured from paper which is essentially free from amine containing material and which is bonded with a sulphur-free or sulphur donor free rubber binder.
Claim 3
Dependent Claim
20 words
The gasket of claim 1 wherein impregnation is carried out after insertion of cylinder bore eyelets and any other eyelets.
Claim 4
Dependent Claim
11 words
The gasket of claim 1 wherein the rubber is nitrile rubber.
Claim 5
Dependent Claim
15 words
The gasket of claim 1 wherein the silicone resin is cured in situ after impregnation.
Claim 6
Dependent Claim
20 words
The gasket of claim 1 wherein the silicone resin is a heat curable poly addition silicone containing a platinum catalyst.
Claim 7
Dependent Claim
19 words
The gasket of claim 1 wherein the silicone resin has a solvent content of less than 5% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |