US3601413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal
Assignee: Texas Instruments Inc
•
Filing: 1969-07-18
•
Granted: 1971-08-24
•
Expires: 1989-07-18
Abstract
Abstract A mechanical seal includes a sealing surface formed by chemical vapor deposition of an extremely hard material, such as silicon carbide. The surface is finished to the required smoothness by optical grinding. The resulting seal has excellent wear resistance as well as high tolerance to corrosive chemicals, extreme temperatures and other adverse operating conditions.
Inventors
- 👤 James R Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:00
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; Y; Y10; Y10S; Y10S277/00; Y10S277/922; Y10S277/935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A mechanical seal comprising: a first sealing member including a hard, wear-resistant silicon carbide sealing surface formed by chemical vapor deposition, and a second sealing member mounted for rotation relative to the first sealing member and including a sealing surface mounted in engagement with the sealing surface of the first sealing member.
Claim 2
Dependent Claim
52 words
A mechanical seal comprising: a first sealing member including a hard, wear-resistant silicon carbide sealing surface formed by chemical vapor deposition, and a second sealing member mounted for rotation relative to the first sealing member and including a sealing surface mounted in engagement with the sealing surface of the first sealing member.
Claim 3
Dependent Claim
32 words
The mechanical seal according to claim 1 wherein the first sealing member includes an annular body of said chemical vapor deposited silicon carbide having a flat, ring-shaped sealing surface formed on it.
Claim 4
Dependent Claim
36 words
The mechanical seal according to claim 2 wherein the second sealing member has a flat, ring-shaped sealing surface formed on it that engages the sealing surface of the body of silicon carbide along a ring-shaped line.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |