US3898729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making drill proof plate for safes
Assignee: OHIO KNIFE CO
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Filing: 1974-02-01
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Granted: 1975-08-12
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Expires: 1994-02-01
Abstract
Abstract A plate structure for safes, vaults and the like, and a method of making it, wherein the plate comprises two or more metallic sheets fused together to form a unitary structure. The plate structure has a barrier layer of hard particles such as carbide particles and the like embedded in the line of fusion between adjacent metallic sheets. Adjacent metallic sheets are provided with layers of borax and a layer of hard particles therebetween, heated to a temperature of from 2300*F to 2400*F and subjected to a pressure in the order of 2500 tons.
Inventors
- 👤 Charles H Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:50
CPC Classifications
E; E05; E05G; E05G1/00; E05G1/02; E05G1/024; B; B23; B23K; B23K20/00; B23K20/16; B23K35/00; B23K35/001; B23K35/22; B23K35/24; B23K35/32; B23K35/327; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12104; Y10T428/12111; Y10T428/12125; Y10T428/12132; Y10T428/12139; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, preforming a thin uniformly distributed layer of abrasive particles on a carrier web, utilizing said carrier web to locate said abrasive particle layer between adjacent surfaces of said sheets and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 2
Independent Claim
77 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, preforming a thin uniformly distributed layer of abrasive particles on a carrier web, utilizing said carrier web to locate said abrasive particle layer between adjacent surfaces of said sheets and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 3
Independent Claim
83 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, locating a thin uniformly distributed layer of abrasive particles between adjacent surfaces of said sheets, locating at least one layer of a mixture of borax and steel particles between said adjacent surfaces of said sheets and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 4
Independent Claim
83 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, locating a thin uniformly distributed layer of abrasive particles between adjacent surfaces of said sheets, locating at least one layer of a mixture of borax and steel particles between said adjacent surfaces of said sheets and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 5
Independent Claim
95 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, locating a thin uniformly distributed layer of abrasive particles between adjacent surfaces of said sheets, coating said adjacent faces of said sheets with borax, subjecting said coated sheets and said interposed particle layer to a heat treatment at a temperature of from about 2300*F to about 2400*F and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 6
Independent Claim
95 words
A method of manufacturing a plate structure comprising the steps of providing at least two metallic sheets, arranging said sheets to form a laminated structure, locating a thin uniformly distributed layer of abrasive particles between adjacent surfaces of said sheets, coating said adjacent faces of said sheets with borax, subjecting said coated sheets and said interposed particle layer to a heat treatment at a temperature of from about 2300*F to about 2400*F and fusing said sheets together to form a unitary plate structure with said particles embedded in the line of fusion between said sheets.
Claim 7
Dependent Claim
26 words
The method claimed in claim 3 including the step of subjecting said heat treated sheets and particle layer to a pressing operation of about 2500 tons.
Claim 8
Dependent Claim
31 words
The method claimed in claim 3 including the step of locating at least one layer of a mixture of borax and steel particles between said sheets prior to said heat treatment.
Claim 9
Independent Claim
132 words
A method of manufacturing a plate structure comprising the steps of providing at least a first and a second metallic sheet, coating a surface of said first and second sheets with borax, locating a thin uniformly distributed layer of abrasive particles on said coated surface of said first sheet, locating said second sheet on top of said first sheet with the coated surface of said second sheet adjacent said particle layer to form a laminated structure, heat treating said laminated structure at a temperature of from about 2300*F to about 2400*F and subjecting said heat treated laminated structure to a pressing operation of about 2500 tons whereby to form a unitary structure with said metallic sheets fused directly together and with said particles embedded in the line of fusion between said sheets.
Claim 10
Independent Claim
132 words
A method of manufacturing a plate structure comprising the steps of providing at least a first and a second metallic sheet, coating a surface of said first and second sheets with borax, locating a thin uniformly distributed layer of abrasive particles on said coated surface of said first sheet, locating said second sheet on top of said first sheet with the coated surface of said second sheet adjacent said particle layer to form a laminated structure, heat treating said laminated structure at a temperature of from about 2300*F to about 2400*F and subjecting said heat treated laminated structure to a pressing operation of about 2500 tons whereby to form a unitary structure with said metallic sheets fused directly together and with said particles embedded in the line of fusion between said sheets.
Claim 11
Dependent Claim
31 words
The method claimed in claim 6 including the step of locating at least one layer of a mixture of borax and steel particles between the coated surfaces of said metallic sheets.
Claim 12
Dependent Claim
35 words
The method claimed in claim 7 including the step of preforming said layer of abrasive particles on a carrier web and utilizing said carrier web to locate said abrasive particle layer between said metallic sheets.
References Cited (Backward Citations)
US952877A
Cited
US1423652A
Cited
US1444610A
Cited
US1536524A
Cited
US1872254A
Cited
US2133294A
Cited
US2372607A
Cited
US3206846A
Cited
US3279049A
Cited
US3479231A
Cited
US3804034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |