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US3764532A
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Self-lubricating solid compositions
Assignee: Harper Packing Company Inc
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Filing: 1970-09-21
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Granted: 1973-10-09
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Expires: 1990-09-21
Abstract
Abstract Self-lubricating solid compositions for use in gas compressors and the like, comprising polytetrafluoroethylene filled with lead and glass additives wherein the glass to lead volume ratio exceeds 3:1.
Inventors
- 👤 S Fisher
- 👤 M Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:17
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/28; C; C10; C10M; C10M7/00; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; C10M2201/00; C10M2201/04; C10M2201/05; C10M2201/12; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10N; C10N2040/00; C10N2040/02; C10N2050/00; C10N2050/08; C10N2050/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
A self-lubricating solid composition for surface contact with a relatively hard, smooth surface where loading pressure is at about 30.5 psi and consisting on a volume basis of: 11.3 percent glass, 3.3 percent lead and 85.4 percent polytetrafluoroethylene whereby the glass to lead volume ratio is 3.4 : 1.
Claim 2
Dependent Claim
49 words
A self-lubricating solid composition for surface contact with a relatively hard, smooth surface where loading pressure is at about 30.5 psi and consisting on a volume basis of 22.6 percent glass, 3.3 percent lead and 74.1 percent polytetrafluoroethylene whereby the glass to lead volume ratio is 6.8 : 1.
Claim 3
Independent Claim
64 words
A method for lubricating a hard smooth surface comprising contacting said surface with a self-lubricating solid composition consisting on a volume basis of: 16.9 percent glass, 3.3 percent lead and 79.8 percent polytetrafluoroethylene whereby the glass to lead volume ratio is 5:1, the contact being such as to provide relative movement between said surface and said composition at loading pressure of about 30.5 psi.
Claim 4
Independent Claim
64 words
A method for lubricating a hard smooth surface comprising contacting said surface with a self-lubricating solid composition consisting on a volume basis of: 11.3 percent glass, 3.3 percent lead and 85.4 percent polytetrafluoroethylene whereby the glass to lead volume ratio is 3.4:1, the contact being such as to provide relative movement between said surface and said composition at loading pressure of about 30.5 psi.
Claim 5
Independent Claim
64 words
A method for lubricating a hard smooth surface comprising contacting said surface with a self-lubricating solid composition consisting on a volume basis of: 22.6 percent glass, 3.3 percent lead and 74.1 percent polytetrafluoroethylene whereby the glass to lead volume ratio is 6.8:1, the contact being such as to provide relative movement between said surface and said composition at loading pressure of about 30.5 psi.
References Cited (Backward Citations)
US26088A
Cited
US2991003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |