US4454088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding a low friction bearing
Assignee: Individual
•
Filing: 1982-05-10
•
Granted: 1984-06-12
•
Expires: 2002-05-10
Abstract
Abstract A composition comprising a chopped, bondable low friction yarn which is made by twisting together filaments of low friction material with filaments of bondable material and by impregnating the yarn with a bonding resin. A low friction bearing, and a process for manufacturing the same, involving the molding of bondable low friction yarn which has been chopped into small pieces, is also disclosed.
Inventors
- 👤 Charles S. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:10
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C43/00; B29C43/02; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/25; B29K2227/00; B29K2227/12; B29K2227/18; B29K2277/00; B29L; B29L2031/00; B29L2031/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A process for making a low friction bearing from filaments of bondable material and filaments of low friction material and bonding resin, said process comprising the steps of: twisting together the filaments of bondable material and the filaments of low friction material to form a bondable low friction yarn; impregnating said bondable low friction yarn with the bonding resin; chopping said bondable low friction yarn; and placing said chopped and impregnated bondable low friction yarn into a mold cavity configured in the shape of the low friction bearing, and applying pressure to said yarn to mold said yarn to form the low friction bearing.
Claim 2
Dependent Claim
104 words
A process for making a low friction bearing from filaments of bondable material and filaments of low friction material and bonding resin, said process comprising the steps of: twisting together the filaments of bondable material and the filaments of low friction material to form a bondable low friction yarn; impregnating said bondable low friction yarn with the bonding resin; chopping said bondable low friction yarn; and placing said chopped and impregnated bondable low friction yarn into a mold cavity configured in the shape of the low friction bearing, and applying pressure to said yarn to mold said yarn to form the low friction bearing.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein said impregnating step comprises impregnating the bondable low friction yarn with a thermosetting resin in the B-stage.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein said impregnating step comprises impregnating the bondable low friction yarn with a thermoplastic resin.
Claim 5
Dependent Claim
24 words
The process of claim 1, wherein said chopping step comprises chopping the bondable low friction yarn into pieces of 1/16 to 1/4 inch long.
Claim 6
Dependent Claim
27 words
The process of claim 1, wherein said twisting step comprises twisting together filaments of polyamide fiber and filaments of polytetrafluoroethylene to form a bondable low friction yarn.
Claim 7
Dependent Claim
48 words
The process of claim 5, wherein said impregnating step comprises impregnating the bondable low friction yarn with sufficient bonding resin to form an impregnated bondable low friction yarn which is 30% to 50% by weight of said resin and the remaining portion is 10% to 50% of polytetrafluoroethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |