Patent US3640760A successfully refreshed from Google Patents.
US3640760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated screens
Assignee: Bird Machine Co Inc
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Filing: 1970-12-18
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Granted: 1972-02-08
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Expires: 1990-12-18
Abstract
Abstract Hard-surfacing a screen with a detonation-deposited coating of bonded refractory particles adhered to the surface of the screen and to one another, the coating overlying substantially only the imperforate area of the screen surface, and having a Vickers Hardness of at least 1,000 VPN (with a 300 gm. load) and a thickness at least on the order of 0.003 inch.
Inventors
- 👤 George E Nichols Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:28
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/0006; B23; B23K; B23K20/00; B23K20/06; B23K20/08; C; C23; C23C; C23C24/00; C23C4/00; C23C4/01; C23C4/12; C23C4/126; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/24322; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The screen of claim 1 wherein said refractory particles are of a cast composition comprising tungsten carbide and a cobalt binder.
Claim 2
Dependent Claim
19 words
The screen of claim 1 wherein said main body portion has a plurality of equally spaced parallel elongated apertures.
Claim 3
Dependent Claim
49 words
The screen of claim 1 wherein said body portion has a screening surface on one side having smaller apertures than those in the opposite surface, said apertures increasing in size between said screen surface and said opposite surface, and said detonation-deposited coating is adhered to said screening surface only.
References Cited (Backward Citations)
US2162808A
Cited
US3425900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |