Patent US4751358A successfully refreshed from Google Patents.
US4751358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooking container having a browning coating for microwave ovens and a method of forming the coating
Assignee: VERRERIE CRISTALLERIE D'ARQUES JG DURAND & CIE 41 AVENUE DU GENERAL DE GAULLE F-62510 ARQUES FRANCE
•
Filing: 1987-05-07
•
Granted: 1988-06-14
•
Expires: 2007-05-07
Abstract
Abstract A cooking receptacle is provided having a browning coating for microwave ovens, and a method of forming such a coating. Said coating, which is external, includes essentially a heating layer made from leadless enamel in which are incorporated electrically conducting elements in the form of a metal powder, this powder being intimately mixed with the enamel, generally in a proportion of 15 to 40% by weight; a protective layer of leadless enamel advantageously covers the heating layer. The layers are deposited on the external surface of the receptacle by silkscreen printing or by decalcomania or by a transfer method and they are subjected to baking at a temperature between 620° and 800° C. The metal powder is formed from at least one substance chosen from the electrically conducting metals such as zinc and the transition elements, the oxides of these metals, and mixtures of these substances.
Inventors
- 👤 Philippe Durand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:57
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
82 words
A browning coating along the outside surface of a cooking receptacle for microwave ovens, said browning coating comprising a heating layer, said heating layer including: a leadless enamel; electrically conducting elements mixed with said enamel, said elements comprising a metal powder selected from the group including electrically conducting metals and mixtures thereof, oxides of said conducting metals and mixtures thereof and mixtures of said metals and said oxides; wherein said heating layer has a thickness between about 12 μm and 30 μm.
Claim 2
Dependent Claim
82 words
A browning coating along the outside surface of a cooking receptacle for microwave ovens, said browning coating comprising a heating layer, said heating layer including: a leadless enamel; electrically conducting elements mixed with said enamel, said elements comprising a metal powder selected from the group including electrically conducting metals and mixtures thereof, oxides of said conducting metals and mixtures thereof and mixtures of said metals and said oxides; wherein said heating layer has a thickness between about 12 μm and 30 μm.
Claim 3
Dependent Claim
40 words
The browning coating of claim 1, wherein said metal powder includes at least one substance selected form the group including zinc, aluminum, copper, nickel, chromium, a transition element and oxides of zinc, aluminum, copper, nickel, chromium and said transition element.
Claim 4
Dependent Claim
26 words
The browning coating of claim 2, wherein said transition element is selected from the group including iridum, platinum, ruthenium, rhodium, palladium, silver, gold, and mixtures thereof.
Claim 5
Dependent Claim
30 words
The browning coating of claim 1, wherein said metal powder includes at least one substance selected from the group including zinc, zinc oxides and mixtures of zinc and zinc oxides.
Claim 6
Dependent Claim
47 words
The browning coating of claim 1, wherein said metal powder includes at least one substance selected from the group including iridium, platinum, ruthenium, rhodium, palladium, silver, gold, mixtures of said substances, oxides of said substances, mixtures of said oxides and mixtures of said substances and said oxides.
Claim 7
Dependent Claim
26 words
The browning coating of claim 1, wherein said metal powder is present in said heating layer in an amount between about 15 and 40 weight percent.
Claim 8
Dependent Claim
19 words
The browning coating of claim 1, further including a protective layer of leadless enamel coated over said heating layer.
Claim 9
Dependent Claim
20 words
The browning layer of claim 7, wherein said protective layer has a thickness between about 10 μm and 20 μm.
Claim 10
Dependent Claim
16 words
The browning coating of claim 7, wherein said leadless enamel includes a mixture of acrylic resins.
Claim 11
Dependent Claim
17 words
The browning coating of claim 9, wherein said heating layer further includes a component comprising mineral substances.
Claim 12
Dependent Claim
17 words
The browning coating of claim 10, wherein said mineral substances are selected from oxides, anydrides, and salts.
Claim 13
Dependent Claim
45 words
The browning coating of claim 11, wherein said mineral substances are selected form the group including SiO 2 , B 2 O 3 , Al 2 O 3 , ZnO, Li 2 O, ZrO 2 , BaO, F 2 SnO 2 and TiO 2 .
Claim 14
Dependent Claim
22 words
The browning coating of claim 9, wherein said leadless enamel is present in an amount between about 25 and 30 weight percent.
Claim 15
Independent Claim
76 words
A method of forming a browning coating on the outside surface of a microwave cooking receptacle, said method comprising depositing a layer of leadless enamel that is mixed with electrically conducting elements along the outside surface of said receptacle; and baking said layer at a temperature between about 620° and 800° C. in order to form a heating layer on the outside surface of said receptacle having a thickness between about 12 μm and 30 μm.
Claim 16
Independent Claim
76 words
A method of forming a browning coating on the outside surface of a microwave cooking receptacle, said method comprising depositing a layer of leadless enamel that is mixed with electrically conducting elements along the outside surface of said receptacle; and baking said layer at a temperature between about 620° and 800° C. in order to form a heating layer on the outside surface of said receptacle having a thickness between about 12 μm and 30 μm.
Claim 17
Dependent Claim
34 words
The method of claim 14, wherein said electrically conducting elements comprise a metal powder in an amount between about 15 and 40 weight percent based on the total weight of the resulting heating layer.
Claim 18
Dependent Claim
20 words
The method of claim 15, wherein said protective layer is deposited at a thickness between about 10 and 20 μm.
Claim 19
Dependent Claim
27 words
The method of claim 14, further including the step of depositing a protective layer of leadless enamel over said mixed enamel layer prior to said baking step.
Claim 20
Dependent Claim
15 words
The method of claim 14, wherein said layer is deposited by hot silk screen printing.
Claim 21
Dependent Claim
45 words
The method of claim 18, wherein said leadless enamel includes a thermofusible binder melting at a temperature between about 40° and 60° C., and wherein said enamel is supplied through a conducting silkscreen printing cloth heated to a temperature between about 60° and 80° C.
Claim 22
Dependent Claim
15 words
The method of claim 14, wherein said layer is deposited by decalcomania at ambient temperature.
Claim 23
Dependent Claim
16 words
The method of claim 14, wherein said layer is deposited by means of a transfer method.
Claim 24
Dependent Claim
43 words
A heating layer coated along the outside surface of a microwave oven cooking receptacle, said heating layer comprising: a leadless enamel; and electrically conducting elements mixed with said enamel; wherein said heating layer has a thickness betwen about 12 μm and 30 μm.
Claim 25
Dependent Claim
43 words
A heating layer coated along the outside surface of a microwave oven cooking receptacle, said heating layer comprising: a leadless enamel; and electrically conducting elements mixed with said enamel; wherein said heating layer has a thickness betwen about 12 μm and 30 μm.
Claim 26
Dependent Claim
15 words
The heating layer of claim 22, wherein said electrically conducting elements comprise a metal powder.
Claim 27
Dependent Claim
26 words
The heating layer of claim 23, wherein said metal powder is present in said heating layer in an amount between about 15 and 40 weight percent.
Claim 28
Dependent Claim
19 words
The heating layer of claim 22, wherein said heating layer is coated with a protective layer of leadless enamel.
Claim 29
Dependent Claim
74 words
A cooking receptacle suitable for repeated use in a microwave oven and repeated washing comprising: a heating layer coated along the outside surface thereof, said heating layer including a leadless enamel and electrically conducting elements mixed with said enamel, said heating layer coated along the outside surface of said cooking receptacle by depositing a layer of said leadless enamel thereon and then baking said layer at a temperature between about 620° and 800° C.
Claim 30
Dependent Claim
74 words
A cooking receptacle suitable for repeated use in a microwave oven and repeated washing comprising: a heating layer coated along the outside surface thereof, said heating layer including a leadless enamel and electrically conducting elements mixed with said enamel, said heating layer coated along the outside surface of said cooking receptacle by depositing a layer of said leadless enamel thereon and then baking said layer at a temperature between about 620° and 800° C.
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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |