US4150998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary sealant abradable material and method for making
Assignee: General Electric Co
•
Filing: 1976-12-09
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Granted: 1979-04-24
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Expires: 1996-12-09
Abstract
Abstract Abradable materials useful as rotary sealant are provided and a method for making such materials. A mixture of silicon powder having a particular particle size range, carbon fiber and a binder is initially pressed to shape and thereafter heated in a mold to an elevated temperature to produce a shaped abradable mass.
Inventors
- 👤 Charles R. Morelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:48
CPC Classifications
C; C22; C22C; C22C49/00; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/71; C04B35/78; C04B35/80; C04B37/00; C04B37/003; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/48; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/60; C04B2235/616; C04B2237/00; C04B2237/02; C04B2237/16; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/365; C04B2237/38; C04B2237/50; C04B2237/61
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A method for making a shaped abradable mass useful as a rotary sealant comprising (1) mixing together by weight from 60% to 80% of silicon powder having an average particle size with 20% to 40% of carbon fiber having a length to diameter ratio with average value of from 1 to 20 and from 5% to 20% of an organic binder based on the weight of mixture, (2) shaping the mixture of (1) under heat and a pressure of up to 2000 psi to produce a preform and (3) molding the preform of (2) under reduced pressure at a temperature in the range of 1500° C. to 1800° C.
Claim 2
Independent Claim
109 words
A method for making a shaped abradable mass useful as a rotary sealant comprising (1) mixing together by weight from 60% to 80% of silicon powder having an average particle size with 20% to 40% of carbon fiber having a length to diameter ratio with average value of from 1 to 20 and from 5% to 20% of an organic binder based on the weight of mixture, (2) shaping the mixture of (1) under heat and a pressure of up to 2000 psi to produce a preform and (3) molding the preform of (2) under reduced pressure at a temperature in the range of 1500° C. to 1800° C.
Claim 3
Dependent Claim
13 words
A method in accordance with claim 1, where the binder is paraffin wax.
Claim 4
Dependent Claim
18 words
A method in accordance with claim 1, where the carbon fiber is obtained from a carbon felt cloth.
Claim 5
Dependent Claim
62 words
Rotary sealant material which is readily machinable and has a density of from 1.1 to 1.3, comprising the reaction product of 20% to 40% by weight of carbon fiber whose length to diameter ratio has an average value of from 1 to 20 and 60% to 80% by weight silicon powder having an average diameter of from 25 microns to 200 microns.
Claim 6
Dependent Claim
62 words
Rotary sealant material which is readily machinable and has a density of from 1.1 to 1.3, comprising the reaction product of 20% to 40% by weight of carbon fiber whose length to diameter ratio has an average value of from 1 to 20 and 60% to 80% by weight silicon powder having an average diameter of from 25 microns to 200 microns.
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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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |