Patent EP0649637A1 successfully refreshed from Google Patents.
US3795494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erosion resistant wares composed predominantly of chromium bearing steel
Assignee: National Research Corp
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Filing: 1972-03-20
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Granted: 1974-03-05
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Expires: 1992-03-20
Abstract
Abstract Chromium bearing steel wares are rendered resistant to aerodynamic erosion by multiple coating thereof. The outermost coating comprises boron carbide.
Inventors
- 👤 M Hordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:35
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0635; C23C14/14; C23C14/16; C23C28/00; C23C28/30; C23C28/32; C23C28/322; C23C28/34; C23C28/341; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12771; Y10T428/12806; Y10T428/12861; Y10T428/12937
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
The coated ware of claim 1 wherein the coating layer of (a) is nickel and has a thickness of between 0.05 and 0.20 micron.
Claim 2
Dependent Claim
22 words
The coated ware of claim 1 wherein the intermediate titanium layer of (b) has a thickness of between 10 and 15 microns.
Claim 3
Dependent Claim
21 words
The coated ware of claim 1 wherein the boron carbide layer of (c) has a thickness of greater than 20 microns.
Claim 4
Dependent Claim
25 words
The coated ware of claim 1 wherein the boron carbide layer of (c) has a total carbon concentration of between 18 and 25 atomic percent.
Claim 5
Dependent Claim
14 words
The coated ware of claim 1 having the form of a turbine compressor blade.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |