Patent US3602979A successfully refreshed from Google Patents.
US3602979A
Expired / Lapsed
US
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Bonding of reinforced teflon to metals
Assignee: National Aeronautics and Space Administration
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Filing: 1970-01-28
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Granted: 1971-09-07
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Expires: 1990-01-28
Abstract
Abstract Reinforced FEP Teflon composite material is bonded to a metal substrate by applying a thin layer of copper on the metal surface, disposing irregularly shaped copper particles on the coated surface, assembling the reinforced Teflon in contact with the particles and heating the assembly under pressure at an elevated temperature below the melting point of the Teflon. A diffusion bond stronger than the reinforced Teflon component is produced, thus enabling the fabrication of self-lubricating bodies having relatively high strength.
Inventors
- 👤 Felix P La Iacona
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:19
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/48; B29C65/02; B29C65/486; B29C65/4865; B29C65/487; B29C65/4875; B29C65/4885; B29C65/489; B29C66/00; B29C66/01; B29C66/05; B29C66/303; B29C66/3034; B29C66/30341; B29C66/70; B29C66/71; B29C66/74; B29C66/742; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/91935; B29C66/72; B29C66/721; B29C66/7212; B29C66/92; B29C66/929; B29C66/94; B29C66/949
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
The method of claim 1 wherein said Teflon-base material is reinforced FEP Teflon.
Claim 2
Dependent Claim
19 words
The method of claim 2 wherein said assembly is heated to a temperature of 550* F. to 580* F.
Claim 3
Dependent Claim
19 words
The method of claim 3 wherein said members are compressed together at a pressure of 2,350 to 2,650 p.s.i.
Claim 4
Dependent Claim
21 words
The method of claim 4 wherein said assembly is held at said temperature for a period of at least 25 minutes.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein said copper particles are copper filings having a particle size of -120, +200 mesh.
Claim 6
Dependent Claim
20 words
The method of claim 6 wherein said copper coating is applied by means of an electrolytic flash or strike step.
Claim 7
Dependent Claim
24 words
The method of clAim 7 wherein a liquid flux is applied to said copper coating prior to disposing said copper particles in contact therewith.
Claim 8
Dependent Claim
10 words
The method of claim 2 wherein said metal is steel.
Claim 9
Dependent Claim
40 words
The method of claim 2 wherein said reinforced FEP Teflon consists of a dispersion of bronze particles in FEP Teflon, said dispersion having been prepared by mixing finely divided FEP Teflon and bronze and heating the resulting mixture under pressure.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein said Teflon-base material is TFE Teflon.
Claim 11
Dependent Claim
32 words
The method claim 11 wherein said assembly is heated to a temperature of 300* F. to 375* F. and said members are compressed together at a pressure of 1,000 to 1,500 p.s.i.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |