CN217039665U - Steam generator for cooking utensil - Google Patents
Steam generator for cooking utensil Download PDFInfo
- Publication number
- CN217039665U CN217039665U CN202220645372.XU CN202220645372U CN217039665U CN 217039665 U CN217039665 U CN 217039665U CN 202220645372 U CN202220645372 U CN 202220645372U CN 217039665 U CN217039665 U CN 217039665U
- Authority
- CN
- China
- Prior art keywords
- steam generator
- stainless steel
- heating tube
- tube
- cooking appliance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010411 cooking Methods 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 44
- 239000010935 stainless steel Substances 0.000 claims abstract description 44
- 238000004512 die casting Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 11
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000003595 mist Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Cookers (AREA)
Abstract
The utility model belongs to the technical field of steam cooking appliances, in particular to a steam generator of a cooking appliance, which comprises an evaporator main body formed by die casting; a heating tube and a stainless steel spiral tube for water to pass through are embedded in the evaporator main body, the stainless steel spiral tube is provided with a cylindrical spiral part, a clearance area is arranged at the position of a rotating axis of the cylindrical spiral part, and the heating tube is arranged in the clearance area; the middle part of stainless steel spiral pipe sets up cylindricality helical portion, and cylindricality helical portion adopts helical structure to set up, can increase the stroke of rivers, when the section of being heated is flowed through to rivers, and it is more even to the rivers heating, improves heating efficiency, and the reinforcing heating effect, and what chooseed for use is food level stainless steel, chooses for use great nonrust steel pipe for use, avoids producing the incrustation scale, and the life-span is more secure.
Description
Technical Field
The utility model belongs to the technical field of steam cooking utensil, especially, relate to a cooking utensil steam generator.
Background
Present steam generator for steam cooking utensil on the market, some have used the die-casting aluminium household utensils, through the heating tube heating with the water in giving the die-casting aluminium household utensils with heat transfer, produce steam reentrant steam cooking utensil's furnace chamber behind the water heating, some directly install steam generator in steam cooking utensil's furnace chamber bottom, become exposed steam generator, generate steam with the water boiling mode of direct contact, these steam generator who produces steam who lifts have following drawback: 1. a steam generator of die-casting aluminum, the inner surface of a die-casting aluminum utensil is in a high-temperature and high-humidity environment for a long time, aluminum oxide substances appear on the surface of the die-casting aluminum utensil, and the aluminum oxide substances are sprayed out by steam and enter a furnace cavity to be white powdery substances, so that unsafe influence is brought to food cooking; 2. to using and installing steam generator in the furnace chamber, steam generator surface boils the water back for a long time, also can appear the material of aluminium oxide, and influences the outward appearance, and during clean cavity, it is extremely inconvenient, especially the sealing washer structure of steam generator week circle, high temperature toasts and boils the back, can produce ageing damage after ageing, influences heating element and the electric elements of steam generator bottom, has serious potential safety hazard. In view of the steam cooking appliance using the above steam generator design, the appearance, safety and cleaning experience are inconvenient for consumers.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cooking utensil steam generator aims at solving the technical problem that steam generator among the prior art is clean inconvenient and the security is low.
In order to achieve the above objects, an embodiment of the present invention provides a steam generator for cooking utensil, which is characterized in that: comprises an evaporator main body formed by die casting; the evaporator body is embedded with a heating tube and a stainless steel spiral tube for water to pass through, the stainless steel spiral tube is provided with a cylindrical spiral part, the rotation axis position of the cylindrical spiral part is provided with a space avoiding area, and the heating tube is arranged in the space avoiding area.
Optionally, the heating tube is arranged in a U-shaped structure for increasing the heating area of the heating tube.
Optionally, the heat generating tubes comprise a first heat generating tube and a second heat generating tube; the first heating tube and the second heating tube are arranged side by side, and the first heating tube and the second heating tube are arranged in the void avoiding area of the cylindrical spiral part.
Optionally, the evaporator main body is provided with an automatic reset temperature controller for detecting the temperature of the evaporator main body, and the automatic reset temperature controller is electrically connected with the heating tube.
Optionally, the evaporator main body is provided with a manual reset temperature controller for detecting the temperature of the evaporator main body; the manual reset temperature controller is electrically connected with the heating tube.
Optionally, the outer side surface of the evaporator main body is provided with an installation part, the end surface of the installation part is provided with a heat conduction silicone grease layer, and the automatic reset temperature controller and the manual reset temperature controller are both arranged on the end surface of the installation part.
Optionally, the outer side of the evaporator main body is provided with a fixing part for assembling, and the fixing part is provided with a threaded hole.
Optionally, the evaporator main body is provided with a temperature sensor and a main board, and the temperature sensor is electrically connected with the main board.
Optionally, the stainless steel spiral pipe has a water inlet end and a steam outlet end, and the steam outlet end is provided with a silicone tube for conveying steam.
Optionally, the water inlet end is provided with a water inlet stainless steel pipe, the water inlet stainless steel pipe extends outwards and extends out of the outer side of the evaporator main body, the steam outlet end is provided with a steam outlet stainless steel pipe, and the steam outlet stainless steel pipe is communicated with the silicone tube.
The embodiment of the utility model provides an among the cooking utensil steam generator above-mentioned one or more technical scheme have one of following technological effect at least: the heating pipe works and heats, then water flows into the stainless steel spiral pipe, the heating pipe heats the water in the stainless steel spiral pipe, cold water is quickly changed into mist high-temperature steam, and the mist high-temperature steam enters the cavity of the cooking utensil to heat food, so that the food is steamed; the middle part of stainless steel spiral pipe sets up cylindricality helical part, and cylindricality helical part adopts the helical structure setting, can increase the stroke of rivers, when the section of being heated is flowed through to the rivers, and it is more even to the rivers heating, improves heating efficiency, and the reinforcing heating effect, and what chooseed for use is food level stainless steel, chooses for use great nonrust steel pipe, avoids producing the incrustation scale, and the life-span is more secure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a steam generator of a cooking appliance according to an embodiment of the present invention.
Fig. 2 is a partial sectional view of a steam generator of a cooking appliance according to an embodiment of the present invention.
Fig. 3 is a partial cross-sectional view of a spiral stainless steel pipe provided by an embodiment of the present invention.
Fig. 4 is an exploded schematic view of a steam generator of a cooking appliance according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10-evaporator body 11-fixing part 20-heating tube
21-first heating pipe 22-second heating pipe 30-stainless steel spiral pipe
31-cylindrical spiral part 32-silicone tube 33-water inlet stainless steel tube
34-stainless steel tube for steam outlet 40-automatic reset temperature controller 41-manual reset temperature controller
43-temperature sensor.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-4 are exemplary and intended to be used to explain embodiments of the present invention, but should not be construed as limiting the invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings only for the convenience of description of the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
In one embodiment of the present invention, as shown in fig. 1-4, a cooking appliance steam generator is provided, which is used in a cooking appliance, such as a steam oven; the cooking appliance steam generator includes a pressure-cast evaporator body 10; the evaporator body 10 is embedded with a heating tube 20 and a stainless steel spiral tube 30 for water to pass through, the stainless steel spiral tube 30 has a cylindrical spiral part 31, a rotation axis position of the cylindrical spiral part 31 is provided with a clearance area, and the heating tube 20 is arranged in the clearance area.
In the embodiment of the present invention, the heating tube 20 works and generates heat, and then water flows into the stainless steel spiral tube 30, the heating tube 20 heats the water in the stainless steel spiral tube 30, so as to rapidly change cold water into mist high-temperature steam, and the mist high-temperature steam enters the cavity of the cooking utensil to heat food, thereby steaming the food; the middle part of stainless steel spiral pipe 30 sets up cylindricality helical part 31, and cylindricality helical part 31 adopts the helical structure setting, can increase the stroke of rivers, when the rivers are flowed through the zone of being heated, more even to the rivers heating, improves heating efficiency, and reinforcing heating effect, and what chooseed for use is food level stainless steel, chooses for use great nonrust steel pipe for use, avoids producing the incrustation scale, and the life-span is more secure.
Specifically, the main body of the steam generator is a die-casting aluminum part, when the steam generator is manufactured by die-casting, the assembled heating tube 20 is inserted into a clearance area of the stainless steel spiral tube 30, the stainless steel spiral tube is clamped after the direction is determined, then the stainless steel spiral tube is placed in a die-casting die, molten metal is injected into the die-casting die by high pressure, and the evaporator main body 10 is formed after the molten metal is solidified, so that the forming process is completed.
In another embodiment of the present invention, the heating tube 20 of the steam generator of the cooking utensil is in a U-shaped structure for increasing the heating area of the heating tube 20, increasing the heating effect on the stainless steel spiral tube 30, and further improving the heating efficiency.
In another embodiment of the present invention, the heat generating tube 20 of the steam generator of the cooking appliance includes a first heat generating tube 21 and a second heat generating tube 22; the first heating pipe 21 and the second heating pipe 22 are arranged side by side, and both the first heating pipe 21 and the second heating pipe 22 are arranged in the evading area of the cylindrical spiral part 31; the power of the heating tube 20 can be effectively controlled, the application of various cooking modes can be realized by matching programs, and meanwhile, the heating tube 20 is more durable and has longer service life.
In another embodiment of the present invention, the evaporator body 10 of the steam generator of the cooking appliance is provided with an automatic reset temperature controller 40 for detecting the temperature of the evaporator body 10, the automatic reset temperature controller 40 is electrically connected to the heating tube 20 to realize the automatic reset function, and has the function of protecting the safety of the circuit; cooking utensil steam generator starts the back, and the heating pipe heating makes the temperature of evaporimeter main part 10 rise, starts the water pump, if the out of work of water pump trouble this moment, then the temperature of evaporimeter main part 10 will further rise, when reaching the settlement threshold value of automatic re-setting temperature controller 40, and the circuit cuts off, avoids steam generator to take place the overheated condition of temperature, improves cooking utensil steam generator's stability.
In another embodiment of the present invention, the evaporator body 10 of the steam generator of the cooking appliance is provided with a manual reset temperature controller 41 for detecting the temperature of the evaporator body 10; the manual reset temperature controller 41 is electrically connected with the heating tube 20, the manual reset temperature controller is installed, the temperature cut-off point is higher than that of the automatic reset temperature controller 40, when the automatic reset temperature controller 40 fails and the temperature continuously rises to reach the cut-off point of the manual reset temperature controller 41, the circuit is disconnected, and double protection is achieved; and warning a user to disassemble and maintain in time, replace the old element in time and continue to protect the circuit.
In another embodiment of the utility model, the lateral surface of this cooking utensil steam generator's evaporimeter main part 10 is equipped with the installation department, is equipped with the heat conduction silicone grease layer on the terminal surface of installation department, and automatic re-setting temperature controller 40 and manual re-setting temperature controller 41 all locate on the terminal surface of installation department, set up the heat conduction silicone grease layer and help carrying out the temperature transmission, improve detection effect, improve space utilization.
In another embodiment of the present invention, the outer side surface of the evaporator body 10 of the steam generator of the cooking appliance is provided with a fixing portion 11 for assembling, and the fixing portion 11 is provided with a threaded hole for facilitating the assembling.
In another embodiment of the present invention, the evaporator main body 10 of the steam generator of the cooking appliance is provided with a temperature sensor 43 and a main board, and the temperature sensor 43 is electrically connected with the main board; the temperature of the steam generator can be monitored at any time, and real-time monitoring can be realized by polling the surface temperature value of the steam generator; meanwhile, the temperature sensor 43 can determine whether the water supply device connected with the evaporator main body 10 is lack of water by sensing temperature and combining with a preset program (the program is well known to those skilled in the art), so that materials of a set of water level detection system for detecting the water level of the water supply device can be saved, and the manufacturing cost is further saved; specifically as follows, evaporimeter main part 10 passes through water pump and water supply installation's water tank intercommunication, according to the program set, when the temperature of evaporimeter main part 10 reached the pump water temperature, does not sense the temperature of evaporimeter main part 10 and has reduced, through the detection to the number of times of operation of water pump, can judge whether water supply installation's water tank lacks water to indicate the warning at external display interface.
The operating mode of the cooking appliance steam generator is as follows:
firstly, the temperature sensor 43 of the evaporator main body 10 is connected with the main board to receive the program instruction of the main board;
two, select the steam mode on cooking utensil's functional panel, start-up work, the 20 start-up work of heating tube of evaporimeter main part 10 this moment, begin to heat, when the temperature of evaporimeter main part 10 reached the pump water temperature numerical value of settlement, water pump work extracts the stainless steel spiral pipe 30 with the water in the water tank in, cold water gets into and is heated behind the stainless steel spiral pipe 30, just be vaporific high-temperature steam when discharging from stainless steel spiral pipe 30, high-temperature steam heats food in getting into cooking utensil's the cavity, thereby cook food.
In another embodiment of the present invention, the stainless steel spiral tube 30 of the steam generator of the cooking utensil has a water inlet end and a steam outlet end, and the steam outlet end is provided with a silicone tube 32 for delivering steam, so as to input the generated high-temperature steam into the cavity of the cooking utensil.
In another embodiment of the present invention, the water inlet end of the steam generator of the cooking device is provided with a water inlet stainless steel tube 33, the water inlet stainless steel tube 33 extends outwards and extends out of the outer side of the evaporator main body 10, the steam outlet end is provided with a steam outlet stainless steel tube 34, the steam outlet stainless steel tube 34 is communicated with the silicone tube 32, and the cooling water inlet and the high temperature steam outlet are facilitated.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A cooking appliance steam generator characterized by: comprises an evaporator main body formed by die casting; the evaporator body is embedded with a heating tube and a stainless steel spiral tube for water to pass through, the stainless steel spiral tube is provided with a cylindrical spiral part, the rotation axis position of the cylindrical spiral part is provided with a space avoiding area, and the heating tube is arranged in the space avoiding area.
2. The cooking appliance steam generator of claim 1, wherein: the heating tube is arranged in a U-shaped structure and used for increasing the heating area of the heating tube.
3. The cooking appliance steam generator of claim 2, wherein: the heating tube comprises a first heating tube and a second heating tube; the first heating tube and the second heating tube are arranged side by side, and the first heating tube and the second heating tube are arranged in the void avoiding area of the cylindrical spiral part.
4. The cooking appliance steam generator of claim 1, wherein: the evaporator main body is provided with an automatic reset temperature controller used for detecting the temperature of the evaporator main body, and the automatic reset temperature controller is electrically connected with the heating tube.
5. The cooking appliance steam generator of claim 4, wherein: the evaporator main body is provided with a manual reset temperature controller used for detecting the temperature of the evaporator main body, and the manual reset temperature controller is electrically connected with the heating tube.
6. The cooking appliance steam generator of claim 5, wherein: the lateral surface of evaporimeter main part is equipped with the installation department, be equipped with heat conduction silicone grease layer on the terminal surface of installation department, the automatic re-setting temperature controller with the manual re-setting temperature controller is all located on the terminal surface of installation department.
7. The cooking appliance steam generator according to any one of claims 1 to 6, wherein: the lateral surface of evaporimeter main part is equipped with the fixed part that is used for the assembly, the fixed part is equipped with the screw hole.
8. The cooking appliance steam generator according to any one of claims 1 to 6, wherein: the evaporator main body is provided with a temperature sensor and a mainboard, and the temperature sensor is electrically connected with the mainboard.
9. The cooking appliance steam generator according to any one of claims 1 to 6, wherein: the stainless steel spiral pipe is provided with a water inlet end and a steam outlet end, and the steam outlet end is provided with a silicone tube for conveying steam.
10. The cooking appliance steam generator of claim 9, wherein: the water inlet end is provided with a water inlet stainless steel pipe, the water inlet stainless steel pipe extends outwards and extends out of the outer side of the evaporator main body, the steam outlet end is provided with a steam outlet stainless steel pipe, and the steam outlet stainless steel pipe is communicated with the silicone tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220645372.XU CN217039665U (en) | 2022-03-22 | 2022-03-22 | Steam generator for cooking utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220645372.XU CN217039665U (en) | 2022-03-22 | 2022-03-22 | Steam generator for cooking utensil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217039665U true CN217039665U (en) | 2022-07-26 |
Family
ID=82490535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220645372.XU Active CN217039665U (en) | 2022-03-22 | 2022-03-22 | Steam generator for cooking utensil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217039665U (en) |
-
2022
- 2022-03-22 CN CN202220645372.XU patent/CN217039665U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20190162204A1 (en) | Centrifugal pump cover | |
| CN211984990U (en) | Steam cooking device | |
| CN112056944A (en) | Control method of steam cooking equipment and steam cooking equipment | |
| CN211692951U (en) | Pump cover assembly for integrated heating pump and integrated heating pump | |
| CN217039665U (en) | Steam generator for cooking utensil | |
| JP2000028199A (en) | Water heater and heating element | |
| CN217039726U (en) | Cooking utensil | |
| EP2112438A2 (en) | Heat exchanger for fluids | |
| KR20120020190A (en) | Miniaturized vacuum electric hot water boiler | |
| CN202858805U (en) | Direct temperature-sensing type electric cooker | |
| CN102068206A (en) | Method for heating water by utilizing heating pipeline and tea making machine employing method | |
| CN209655563U (en) | A kind of electric heat water tank with constant temperature system | |
| CN218955204U (en) | Liquid heater | |
| CN209978140U (en) | Take overtemperature prote function's bushing type hanging stove | |
| CN204388364U (en) | A kind of storage-type electric water heater magnesium rod assembly | |
| CN210930838U (en) | High-efficiency evaporator and steam cooking equipment using same | |
| CN210277103U (en) | Heating disc structure for dish washer motor | |
| CN215835575U (en) | Heating device and pump with same | |
| US11892009B2 (en) | Blade-heating heat pump cover and heat pump | |
| CN209186324U (en) | One kind simmering machine | |
| CN102657476B (en) | Electric kettle | |
| JP2001324219A (en) | Electric water heater | |
| CN202262843U (en) | Water heating device for household appliance | |
| CN214315647U (en) | Heating device and pump with same | |
| CN215383111U (en) | Cooking utensil with reliable fixation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240805 Address after: 529000 Building 1, No. 313 Longxi Road, Jianghai District, Jiangmen City, Guangdong Province (Information Declaration) Patentee after: Jiangmen Tianzhuo Smart Home Co.,Ltd. Country or region after: China Address before: 523000 peach garden high tech Industrial Park, Hengli Town, Dongguan, Guangdong Patentee before: GUANGDONG TIANZHUO INTELLIGENT HOME CO.,LTD. Country or region before: China |
|
| TR01 | Transfer of patent right |