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US4075111A
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Heavy metal chalcogenide-polyimide lubricative composites
Assignee: Raytheon Co
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Filing: 1976-04-19
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Granted: 1978-02-21
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Expires: 1996-04-19
Abstract
Abstract Self-lubricating composites of high thermal stability, excellent frictional characteristics and wear resistance are formulated from molybdenum disulfide, tungsten disulfide, molybdenum diselenide and thermosetting acetylene-substituted polyimide oligomers.
Inventors
- 👤 Norman Bilow
- 👤 Michael N. Gardos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:33
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C10; C10M; C10M111/00; C10M111/04; C10M2201/00; C10M2201/06; C10M2201/065; C10M2201/066; C10M2217/00; C10M2217/04; C10M2217/042; C10M2217/043; C10M2217/044; C10M2217/045
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A self-lubricating composite comprised of an addition type polymerization polyimide taken from the group consisting of an acetylene-terminated polyimide oligomer selected from the group whose structures consist of: ##STR3## ,where, N is 1-3, blended with a solid lubricative pigment taken from the group of heavy metal chalcogenides consisting of molybdenum disulfide, molybdenum diselenide, tungsten disulfide and diselenide and wherein the ratio of said polyimide to said pigment ranges from 90:10 to 30:70 percent by weight.
Claim 2
Dependent Claim
75 words
A self-lubricating composite comprised of an addition type polymerization polyimide taken from the group consisting of an acetylene-terminated polyimide oligomer selected from the group whose structures consist of: ##STR3## ,where, N is 1-3, blended with a solid lubricative pigment taken from the group of heavy metal chalcogenides consisting of molybdenum disulfide, molybdenum diselenide, tungsten disulfide and diselenide and wherein the ratio of said polyimide to said pigment ranges from 90:10 to 30:70 percent by weight.
Claim 3
Dependent Claim
13 words
The composite of claim 1 wherein said polyimide oligomer has the formula: ##STR4##
Claim 4
Dependent Claim
12 words
The composite of claim 2 wherein said pigment is MoS 2 .
Claim 5
Dependent Claim
12 words
The composite of claim 2 wherein said pigment is WS 2 .
References Cited (Backward Citations)
US3671486A
Cited
US3608054A
Cited
US3652409A
Cited
US3629103A
Cited
US3781205A
Cited
US3845018A
Cited
US3879349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |