TW209186B - - Google Patents
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- TW209186B TW209186B TW081102638A TW81102638A TW209186B TW 209186 B TW209186 B TW 209186B TW 081102638 A TW081102638 A TW 081102638A TW 81102638 A TW81102638 A TW 81102638A TW 209186 B TW209186 B TW 209186B
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- TW
- Taiwan
- Prior art keywords
- knife
- item
- composite
- inlay
- twist drill
- Prior art date
Links
- 239000002131 composite material Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 19
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 8
- 239000010432 diamond Substances 0.000 claims abstract description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052737 gold Inorganic materials 0.000 claims description 13
- 239000010931 gold Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 2
- QRJOYPHTNNOAOJ-UHFFFAOYSA-N copper gold Chemical compound [Cu].[Au] QRJOYPHTNNOAOJ-UHFFFAOYSA-N 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000005219 brazing Methods 0.000 abstract 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 244000227633 Ocotea pretiosa Species 0.000 description 1
- 235000004263 Ocotea pretiosa Nutrition 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003657 tungsten Chemical class 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P5/00—Setting gems or the like on metal parts, e.g. diamonds on tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/148—Composition of the cutting inserts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/58—Chisel-type inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/28—Details of hard metal, i.e. cemented carbide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/31—Diamond
- B23B2226/315—Diamond polycrystalline [PCD]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S76/00—Metal tools and implements, making
- Y10S76/11—Tungsten and tungsten carbide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S76/00—Metal tools and implements, making
- Y10S76/12—Diamond tools
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/78—Tool of specific diverse material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/81—Tool having crystalline cutting edge
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling Tools (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Description
ο Μ 五、發明説明() 經濟部中央櫺準局員工消费合作社印製 本發明係有關一種製造複合材質鑲嵌式刀Η和與該鑲 嵌式刀Η結合之麻花鑽的方法,並有關由該方法所做成的 鑲嵌式刀Μ和麻花纘。 具有由多結晶性金鋼鑽(PCD)複合粉粒所構成的錶嵌 式刀Η之麻花鑽已知有各種不間的種類這些型式中之一 種已知的麻花鑽與一種一般為楔形或V型的麻花鑽,它包 含一層兩面各備有薄薄的礞化鎮層的多結晶性金銷讚中心 層,:,該鑲嵌式刀Η是被固定到位在該麻花纘之末端的直徑 式凹槽内,使得該楔形體或V形件之尖端與該鑽頭之中心 線對齊。最後得到的麻花鑽類似一種傳統石工業纘頭,但 具有由該镶嵌式刀Η之鑽石材料做成之_別的鑿刀邊錄c 上述之鑲嵌式刀Η具有一些缺點:第--,該具雙磺化 _層三明治型之雙層多結晶性金鋼纘材料,,比較昂費。 該三明治型材料也遣受相當高程度的内應力,|衍可能需要 使用磺化物作為該鑽頭本體内的媒合材料,,這樣大大地增 加該磨過之麻花鑽的成本:又,這種鑲嵌式刀Η容易斷裂 ,特別是當鑽頭長度超過100到125 Π1Β之時: 依據本發明,--種製造複合材質鑲嵌式刀片的方法包 含幾個步驟: 由一複合金鋼纘小型仔料板形成第一坆第二鑲嵌式刀 Η組合物半Η ,每一値鑲嵌式刀Η之半片卽為-個金鋼鑽 材科做成的刀口;且使這二値鑲嵌式刀Η之半Η背靠背以 便形成一値複合材質鑲嵌式刀Η ,於是各刃口就位在該複 合鑲嵌式刀Η之中心面的兩對邊上。 (請先閲讀背而之注意事項#填W本ί.、 装- 订- -線· 本紙》ΛΑ遑《中«家《率(C*S)甲4規格(210 X 297公釐)-3- 81. 7 . 20,000¾ (H) 經濟部中央標準局Μ工消费合作社印製 五、發明説明() 本發明較合宜包含將兩鑲嵌式刀片之半片結合在一起 以形成一個單一複合鑲嵌式7J Η的步驟。該等鑲嵌式刀η 之半Η可能被做成具有一個矩形撗截面,使得該複合鑲嵌 式刀Η有一摘矩形橫截面且合適地插入位在麻花鑽之末端 内的直徑式槽形座中。 較佳地,各鑲嵌式刀Η之半片的刃口是被配置成一_ V形複合刃口, 本發明可能包含數値步驟,以自一複合金鋼纘小型碟 Η切成一細長Η以便形成一艢邊綠有一條金銷鑽材料的中 間坯料板,以及從該中間坯料板切成數摘鑛嵌式刀Η之半 Η ,所以每一鑲嵌式刀Η之半Η的刃口是由該金銷纘細條 的一部份做成> 更依搛本發明,一種製造麻花纘的方法包含以上述方 法置備鑲嵌式刀片的步驟以及將該鑲嵌式刀Η固定於麻花 鑽本體末端固定座内的步驟: , 該鑲嵌式;:Η可能是·-艢單一鑲嵌刀片,或可能包含 數個同時結合在一起且被用焊接方法固定到該座部的分離 半片。 較佳地,該麻花鑽之圓凹槽和尖端的形狀在該複合鑛 嵌式刀片被固定到該座後用研磨方法回復。 本發明延伸到用上述諸方法製成的複合鑌嵌式刀Η和 麻花鑽。 第1圖是一値一種傳统型多結晶性金鋼石小型碟Κ的 圖示視圖; 本纸張尺本遑用t釀_家樣準(C»S>T4规格(2Ι0Χ»7公釐> -4- 20.000Λ(ΙΙ) (請先閲讀背而之注意事项再填寫本r、 裝· 訂· 線- 20918° Λ 6 Κ6 經濟部中央標準局貝工消费合作社印製 五、發明説明() 第2 _顯示由第1醒之碟Η切出的單一細長坯板; 第3圖顯示一個壤嵌式7J Η半Η ,依據本發明自第2 画之玨板切出; 第4圓顯示一對該鑲嵌式刀Η半Η , Μ詖結合在·起 以形成一個複合鑲嵌式刀Η ; 第5圖顯示第4圖的鑲嵌式刀Η半片及複合鑲嵌式刀 .Η的上視圖Ρ 第6圖是一個依據本發明具有一個禊合鑲嵌式刀Η而 完成組裝的麻花鑽的側視圖; 第7圖是一個經過研磨作業之後的麻花_的_示視圖 第1圖圖示一個複合金鋼鑽小型碟Η 10 ,包含一屬位 在一磺化鏡背層14之上的多結晶性金銷鑽1 2。這類複合金 綱鑽粉粒是眾所週知的且可買得到的.例如,商檫名叫SY NDITE的。 本發明之方法中的第--個步驟是,顯示在第1圖中的 碟Η 10被切成數痼薄細長條形中間坯板1 6 ,如在第2圖中 所顯示。每一中間好板1 6有條在.一邊綠上由金銷鑽材料 做的窄長條18 ,具有由硪化鎢背襯材料做成的較寛部份20 在旁鄰接3 第3圖顯示該中間还板16如何被切來製造具有一楔形 或V形端部,一邊緣與該PCD材料之邊緣長條18重合的鑲 嵌式刀Η半片22。該等半丨-1之一對是被顯示在第4圖中, g己號2 2 , 1和2 2 . 2。該等半Η彼此間被反置且背靠背地組装 (請先閲讀背而之注意事項再蜞寫本t、 裝. 線- 本紙張足摩遑用t謂鼸家«毕(C«S>T4规格(2Κ>χ297公釐)-5- 81. 7. 20,000* (II)
2〇9i8S 經濟部屮央櫺準局β工消费合作社印製 五、發明説明() 以形成一個複合_嵌式刀Η 24。該複合鑲嵌式刀Η的_個 半Η 2 2 . 1和2 2,2是被焊接在一起。該後合鑲嵌式刀Η 24有 一値包含該鑲嵌式刀Η半Η 22 . 1的第一邊26與該鑲嵌式/J Μ半Η 22 . 2的第二邊28的V形複合刀口 :·.第5圖以平ώ圖 示第4鼷的鑲嵌式刀Η半Η和複合鑲嵌式刀片,顯示該等 刃口 26和28的配置,可被看到是位在該複合鑲嵌式刀Η之 中心面A - Α的兩對立邊上。每一値錶嵌式刀片半片有一宰 矩形橫截面形狀,且該複合鑲嵌式刀Η也是具矩形橫截面 的。 第6圖是一麻花鑽之尖端的侧視圖,顯示一値用放電 加工(EDK)刻λ該麻花鑽之末端的槽形直徑式座30。該座 之寬度d等於單一鑲嵌式刀Η半Η的二倍寬度加上被用來 結合該等鑲嵌式刀Η半Η和將該複合鑲嵌式刀Η結合到該 座本身的焊接金鼷薄Η的三倍厚度。一旦該複合切割嵌入 物經用焊接固定到該座30後,該麻花纘的_始幾何形狀則 用研磨回復到尖且圓凹槽的形狀:關於這點,位在該臢頭 凹槽區域内的後合鑲嵌式刀Η的任何研磨將碰到僅PCD材 料的一小厚度(代表上0 . ? 1ΠΒ1 >是有利的,反之,在傳統 雙表層PCD鑲嵌式刀Η的情況下,較大的PCD材料區域必 須被研磨:必須被研磨的金鋼鑽材料的量是小於必須被研 磨的磺化鎢背板材料的量的50% (代表上甚小於50%),:, 第7圖圖示該最終麻花纘頭之末端部份,顯示該等刃 口 26和28如何重曼來構成經研磨過之麻花鑽頭的鑿刀綠。 從第7圖也可明顯看出在該麻花纘頭的圓凹槽的回復過程 (請先W1讀背面之注意事項再填寫本ί. 裝< •奵· 線- 本紙張尺度遑用中家«準(CNS> T 4規格(2丨0父297公釐> -6 - 81. 7 . 20,000張(11} 2〇9lBb Λ 6 Π 6 經濟部中央標準局貝工消费合作社印製 五、發明説明() 中僅少量的金網鑽材料被從該複合鑲嵌式刀Η的每一邊移 去。 儘管利用焊接將二塊鑲嵌式刀Κ半Η結合在一起來構 成單--複合鑲嵌式刀Η是便利的,tt W能將該等半片組裝 在該麻花鑽頭的座内並在將它們焊到該座内之時,同時將 它們焊接在一起。 本發明之方法允許所述的這種糢合鑲嵌式λ) Η能被較 便宜地製造,因為是傳統之PCD小型碟片被使用,而不是 特別的雙表層小型碟片。使用在每一镶嵌式刀Η内的金網 纘材料之量也是較少的。此外,本發明的鑛嵌式刀片可被 固定到傳統鋼製麻花鑽頭的空洞處内,更降低末端産品的 成本c 使用“三明治”材料的習知_嵌式刀片,具有--1 PC D材料介於二磺化鎢層之間,在使用中傾向高度受應力ft 如果該麻花纘頭的柄部比大約1 00到1 25 0B1還長則容贽破 裂。本發明之鑲嵌式刀片受到較小之高度應力且不受到此 相同纘頭長度之限制此外,本發明之方法允許使用傳統 雙層複合小型碟片,丨W不用更貴的三層“三明治”小型 碟Η。 (請先Mift背而之注意事項#填寫本t、 訂· 線· 本紙»尺度遑用+ 家樣JMCHS)甲4规格(210x297公翁)-7- 81. 7. 20,000¾ (I!)
Claims (1)
- Q ο ηΊCo 7 7 7 7 A B c D 經濟部中央標準局員工消費合作杜印製 六、申請專利範圊 1. 一種製造複合壤嵌式刀Η的方法,包含數値步驟: 第一,做成一 Η複合金銷鑽小型坯板,第二,自 該坯板切出數個鑲嵌式刀Η半Η,每-傾鑛嵌式/J Η 半Η定義-摘金綱鑽材料做的刃口;且 使該等鑲嵌式刀片半片背對背排列以做成一個複 合鑲嵌式刀Η,以致各自的刃口位在該複合鑲嵌式刀 Η之一中心面的兩對立邊上: 2. 如申誚專利範圍第1項之方法,包含將該兩鑲嵌式刀 Η半Η結合在一起以做成單一個複合鑌嵌式刀片的步 驟C 3. 如申請專利範圍第2項之方法,其中該等鑌嵌式刀Η 是被焊接在一起以做成單一複合鑛嵌式/J Η : 4. 如申請專利範圍第1項之方法,其中該等鑲嵌式刀片 半Η被做成具有一矩形橫截面.以致該複合鑲嵌式刀 Η有一矩形横截面且適合插入在一麻花鑽頭之末銷内 的直徑式凹槽形座。 5. 如申請專利範圍第1項之方法,其中該鑌嵌式刀Η半 Η的各別刃口是被配置以便定義一 V形複合刀口: 6. 如申請專利範圍第1項之方法,其中該方法的方法包 含自一複台金鋼鑽Φ型碟Η切出一細筷來做成一個在 一邊有一條金網鑽材料做的細條的中間坯板,和Θ該 中間坯板切出該等壤嵌式刀H f- Η ,使得每一鑛嵌式 刀Η半Η的刃口是從該金銅纘細條的一部份做成: 7. 如申請專利範圍第6項之方法,其中該中間坏板包含 (請先聞讀背面之注意事項再琪寫本頁) 本紙很尺度適;Π屮《 W家標準(CNS)ip4规格(210父297公漦)-8- A B c D 2〇αΐ8δ ---- 六'幸請專利範圍 —條較寬之磺化鋳細條,配合..·條較窄的多结晶性金 銷溪細條在其--邊上 8.如申請專利範圍第1項之方法,其中該等\镶嵌式:/ j Η 半片之各別刀口要被配置使得它們在定義該已研磨過 之麻花鑽頭的鑿刀緣的區域内重躉。 9 -種由申請專利範圈第1項之方法做成的複合禳嵌式 刀Η 1 —種製造麻花鑽頭之方法,包含數摘步驟:如申_專 利範圍第9項備置一個複合鑲嵌式刀Η ;和固定Μ複 合鑲嵌式刀Η到一麻花鑽頭本體之末端内的固定座裡 面C, 11.如申請專利範圔第10項之方法,其中該複合鑲嵌式刀 Η是被用焊接固定到該座内的單一鑲嵌式刀H c 12,如申讅專利範圔第1 1項之方法,其中該複合鑛嵌式刀 Η包含兩値同時用焊接結合在起且固定到該座内的 镶嵌式刀片半Η。 經 濟 部 t 央 標 準 局 員 工 消 費 合 作 杜 印 製 i 3,如申請専利範圍第10項之方法,其中該麻花鑽鑽頭之 圓凹槽和尖部的幾何形狀是在該複合_嵌式】j片已被 固定到該座内之後用研_回愎C 14 .如申請專利範圍第1 3項之方法,其中該_嵌式刀η被 研磨部份包含鑽石是小於50% : 15 . —種由申謓專利範圍第1 0項之方法做成的麻花鑽纘頭 本纸張尺度適扣屮WW家橾平(0路)肀4规格(2Ι0χ297&ίέ) -9~·
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GB919104366A GB9104366D0 (en) | 1991-03-01 | 1991-03-01 | Composite cutting insert |
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TW209186B true TW209186B (zh) | 1993-07-11 |
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EP (1) | EP0506238B1 (zh) |
JP (1) | JPH05177455A (zh) |
KR (1) | KR920017760A (zh) |
AT (1) | ATE117926T1 (zh) |
AU (1) | AU645662B2 (zh) |
CA (1) | CA2062090C (zh) |
DE (1) | DE69201316T2 (zh) |
GB (1) | GB9104366D0 (zh) |
TW (1) | TW209186B (zh) |
ZA (1) | ZA921520B (zh) |
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-
1991
- 1991-03-01 GB GB919104366A patent/GB9104366D0/en active Pending
-
1992
- 1992-02-28 AT AT92301722T patent/ATE117926T1/de not_active IP Right Cessation
- 1992-02-28 CA CA002062090A patent/CA2062090C/en not_active Expired - Fee Related
- 1992-02-28 ZA ZA921520A patent/ZA921520B/xx unknown
- 1992-02-28 AU AU11280/92A patent/AU645662B2/en not_active Ceased
- 1992-02-28 EP EP92301722A patent/EP0506238B1/en not_active Expired - Lifetime
- 1992-02-28 US US07/843,447 patent/US5195403A/en not_active Expired - Fee Related
- 1992-02-28 DE DE69201316T patent/DE69201316T2/de not_active Expired - Fee Related
- 1992-02-29 KR KR1019920003358A patent/KR920017760A/ko not_active Application Discontinuation
- 1992-03-02 JP JP4094994A patent/JPH05177455A/ja active Pending
- 1992-04-07 TW TW081102638A patent/TW209186B/zh active
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CA2062090C (en) | 1996-05-28 |
ZA921520B (en) | 1992-11-25 |
EP0506238A3 (en) | 1993-02-03 |
GB9104366D0 (en) | 1991-04-17 |
AU645662B2 (en) | 1994-01-20 |
KR920017760A (ko) | 1992-10-21 |
DE69201316D1 (de) | 1995-03-16 |
CA2062090A1 (en) | 1992-09-02 |
EP0506238B1 (en) | 1995-02-01 |
DE69201316T2 (de) | 1995-06-29 |
JPH05177455A (ja) | 1993-07-20 |
EP0506238A2 (en) | 1992-09-30 |
ATE117926T1 (de) | 1995-02-15 |
US5195403A (en) | 1993-03-23 |
AU1128092A (en) | 1992-09-03 |
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