Patent US3884727A successfully refreshed from Google Patents.
US3884727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating wire screen cloth
Assignee: Premier Refractories and Chemicals Inc
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Filing: 1972-12-21
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Granted: 1975-05-20
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Expires: 1992-12-21
Abstract
Abstract Wire cloth screen is coated with an abrasive and corrosive resistant material by immersing the wire cloth into a chromic acid solution and then heating to form a hard chromic oxide coating. The coating process may be repeated to obtain the desired coating thickness. The coating serves to bond the wires together at the points of intersection and the heating stress relieves the wire.
Inventors
- 👤 Louis John Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:39
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/109
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A METHOD OF TREATING WIRE SCREEN CLOTH SO AS TO FORM A COATING THEREON CONTAINING CHROMIC OXIDE AND TO BOND THE WIRES TOGETHER AT POINTS OF INTERSECTION COMPRISING THE STEPS OF: A. PROVIDING A WIRE SCREEN CLOTH, THE WIRES OF SAID WIRE SCREEN CLOTH HAVING A THIN POROUS OXIDE LAYER THEREON; B. COATING SAID WIRE SCREEN CLOTH WITH A CHROMIC ACID SOLUTION; AND C. HEATING SAID WIRE SCREEN CLOTH TO A TEMPERATURE SUFFICIENT TO CONVERT SAID CHROMIC ACID SOLUTION TO CHROMIC OXIDE ANDTO HEAT TREAT SAID WIRE WHEREBY A COATING OF CHROMIC OXIDE IS FORMED ON SAID WIRES AND SAID WIRES AT THE POINTS OF INTERSECTION ARE BONDED TOGETHER WITH CHROMIC OXIDE.
Claim 2
Independent Claim
112 words
A METHOD OF TREATING WIRE SCREEN CLOTH SO AS TO FORM A COATING THEREON CONTAINING CHROMIC OXIDE AND TO BOND THE WIRES TOGETHER AT POINTS OF INTERSECTION COMPRISING THE STEPS OF: A. PROVIDING A WIRE SCREEN CLOTH, THE WIRES OF SAID WIRE SCREEN CLOTH HAVING A THIN POROUS OXIDE LAYER THEREON; B. COATING SAID WIRE SCREEN CLOTH WITH A CHROMIC ACID SOLUTION; AND C. HEATING SAID WIRE SCREEN CLOTH TO A TEMPERATURE SUFFICIENT TO CONVERT SAID CHROMIC ACID SOLUTION TO CHROMIC OXIDE ANDTO HEAT TREAT SAID WIRE WHEREBY A COATING OF CHROMIC OXIDE IS FORMED ON SAID WIRES AND SAID WIRES AT THE POINTS OF INTERSECTION ARE BONDED TOGETHER WITH CHROMIC OXIDE.
Claim 3
Dependent Claim
41 words
A method of treating wire screen cloth as recited in claim 1 and further including the steps of repeating said coating step (b) and said heating step (c) at least one additional time to form additional coatings of chromic oxide thereon.
Claim 4
Dependent Claim
21 words
A method as recited in claim 1 wherein said chromic acid solution has a specific gravity of from 1.66 to 1.75.
Claim 5
Dependent Claim
67 words
A method of treating wire screen cloth as recited in claim 1 wherein said chromic acid solution is a solution prepared by the process of disolving chromium trioxide in water, slowly boiling said solution, adding activated charcoal to said solution in the ratio of 1 to 20 pounds activated charcoal to 266 pounds chromium trioxide, and continuing said slow boiling until no noticeable reaction is taking place.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |