Patent US4148494A successfully refreshed from Google Patents.
US4148494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary labyrinth seal member
Assignee: General Electric Co
•
Filing: 1977-12-21
•
Granted: 1979-04-10
•
Expires: 1997-12-21
Abstract
Abstract A rotary labyrinth gas seal between a rotating member and a stationary member, one of which includes at least one seal tooth projecting toward a surface of the other member is improved through the provision of an abrasive tip on the projecting tooth. Such abrasive tip comprises an electrodeposited metal matrix which entraps a plurality of abrasive particles protruding from the tip, the thickness of the matrix being less than the longest dimension of the abrasive particles protruding from the tip.
Inventors
- 👤 John W. Zelahy
- 👤 Norman P. Fairbanks
- 👤 Robert E. Maegly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:52
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/02; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939; Y10S277/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
In a rotary labyrinth gas seal in which a first member includes at least one seal tooth having a tip which cooperates with a second member to inhibit gas flow therebetween, the tip comprising a metallic body and an abrasive tip, the improvement wherein: the abrasive tip comprises an electrodeposited metal matrix entrapping a plurality of abrasive particles protruding from the tip, the particles having a hardness greater than the hardness of the second member, the thickness of the matrix being less than the longest dimension of the abrasive particles protruding from the tip.
Claim 2
Dependent Claim
94 words
In a rotary labyrinth gas seal in which a first member includes at least one seal tooth having a tip which cooperates with a second member to inhibit gas flow therebetween, the tip comprising a metallic body and an abrasive tip, the improvement wherein: the abrasive tip comprises an electrodeposited metal matrix entrapping a plurality of abrasive particles protruding from the tip, the particles having a hardness greater than the hardness of the second member, the thickness of the matrix being less than the longest dimension of the abrasive particles protruding from the tip.
Claim 3
Dependent Claim
22 words
The seal of claim 1 in which the metal matrix is selected from the group consisting of nickel and alloys including nickel.
Claim 4
Dependent Claim
32 words
The seal of claim 1 in which the abrasive particles are a nonmetallic material selected from the group consisting of silicides, oxides, borides, nitrides and carbides, stable at an intended operating temperature.
Claim 5
Dependent Claim
15 words
The seal of claim 3 in which the abrasive particles are cubic boron nitride material.
References Cited (Backward Citations)
GB236207A
Cited
US2839413A
Cited
US3068016A
Cited
US3339933A
Cited
US3421862A
Cited
US3481715A
Cited
US3537713A
Cited
US3846899A
Cited
DE2344666A1
Cited
US3975165A
Cited
US3964877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |