CA2120473A1 - Process to manufacture pre-cured tread and vulcanizable rubber compound - Google Patents
Process to manufacture pre-cured tread and vulcanizable rubber compoundInfo
- Publication number
- CA2120473A1 CA2120473A1 CA 2120473 CA2120473A CA2120473A1 CA 2120473 A1 CA2120473 A1 CA 2120473A1 CA 2120473 CA2120473 CA 2120473 CA 2120473 A CA2120473 A CA 2120473A CA 2120473 A1 CA2120473 A1 CA 2120473A1
- Authority
- CA
- Canada
- Prior art keywords
- tread
- rubber
- tire
- layer
- self
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2007/00—Use of natural rubber as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0014—Catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
Landscapes
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
ABSTRACT
An improved Process to Manufacture pre-cured treads to rebuild tire treads and the improved vulcanizable rubber composition for use in such process in which it is essentially foreseen self-adhesive to: (a) arrange a layer of self adhesive vulcanizable rubber composition having from 65% to 75% of natural rubber, from 15 to 30%
of strengthening mineral pigments and from 10 to 15% of curing chemical reactants, onto the lower face of the crude tread body to be bonded to the tire body, before the pre-curing of the tread body , (b) putting a protective plastic sheet under the said vulcanizable rubber layer and (c) pre-curing in a vulcanizing press the said tread structure formed by the tread body, the said lower vulcanizable rubber layer and the said lowermost protective plastic sheet, thus obtaining a pre-cured tire tread element which may be vulcanized and bonded onto a tire carcass,from which the workout original tread was removed, specification.
An improved Process to Manufacture pre-cured treads to rebuild tire treads and the improved vulcanizable rubber composition for use in such process in which it is essentially foreseen self-adhesive to: (a) arrange a layer of self adhesive vulcanizable rubber composition having from 65% to 75% of natural rubber, from 15 to 30%
of strengthening mineral pigments and from 10 to 15% of curing chemical reactants, onto the lower face of the crude tread body to be bonded to the tire body, before the pre-curing of the tread body , (b) putting a protective plastic sheet under the said vulcanizable rubber layer and (c) pre-curing in a vulcanizing press the said tread structure formed by the tread body, the said lower vulcanizable rubber layer and the said lowermost protective plastic sheet, thus obtaining a pre-cured tire tread element which may be vulcanized and bonded onto a tire carcass,from which the workout original tread was removed, specification.
Description
` 2120~73 IMPROVED PROCESS TO MANUFACTURE PRE-CURED TREAD
AND VULCANIZABLE RUBB:ER COMPOUND
The present invention relates to an improved process to manu~acture pre-cured tread s~ructures to replace worn out tire treads on a pneumatic carcaæs of a pneumatic tire to be restored in local tire repairing shops, a~ well as to a vulcanizable rubber compound to bo applied under said tre~d belt.
It is Xnown by the ~rt such as di~clo~ed in the Brazilian Patont Application S/N PI
8806122 ~corresponding to US patent application 393,126 ~iled on August 14, 1989) to improv~ the bonding o~ a pr~-cur~d tread body into the smoothed sur~ace of a pneumatic tire to be restored upon the full removal oP the worn out tire tread, in which the whole lower side of the tread body is provided with corrugation~ obtained in the pr~ curing proce~s o~ the tread body by means of a sheet o cour~e cloth embodied into the said lower face during the pre-curing stage in the vulcanizing press, the said pisce o~ cloth being stripped off before applying the layer o~ bonding material and then submittiny the tire body and the adhering new pre-cured tire tread to final vulcanization, in the tire repair shop.
In ~act, the said operation of ~irstly incorporating he piece of fabric onto tha lower face o~ t~e tread body through its pre-curing, during the manufacture o~ the tire tread unit to be supplied to the tire repair shops may give cause to some drawbacks due to ~he need o~ having the piece of cloth stripped ~rom the tread body to rev al th~ resulting corrugations embossed into th~ lower sur~ace thereo~ by the pressed rough cloth, at the very moment the new tread unt is to be bonded to th~ car~ass of the tire on which the restoration of the :
02 212~73 tread i~ to be performed.
A layer o~ proper bonding material is th~n applied on t,he said wrinkled lower surface of the tread body, fllling in all th~ grooves and a portion of tim~ is to be spent ~or the bonding fluid to dry out. Only then a rubber connecting layer is placed betwe0n the tread and the ti.re body to start the vulcanization of the tread structure.
In some places, lik~ in the United States, the manufa~turer does strip the piece o~
cloth th~re~rom soon after its pre-curing and then does apply the adhesive lay~r on the curru~ated surface and then shi~ld~ it o~f again~t oxida~ion by ~ean~ of a plastic sheet.
In all cas~s, though, th~ said ~take of the art by whic~ the e~bo~sement of the bonding sur~aa~ o~ the tread body i~ carr~ed out by m2an~ o~ a pi~ce of rough iabric, shows the main disadvantageous ~eature of not allowinq a mas~ produc~ion on accoun~ of the huge lo~ o~ time resulting ~rom ~he ~anual steps of:
a - aligning a~d superimposing the extruded ~read body on ~he shee~ o~ rough cloth;
b - taking the two supeximposed but still separate parts, to the pre-curinq pre ~ ~or the molding o~ the tread uni~;
c - stripping of~ the piece of cloth soon after th~ pre~
curing;
d - applying a layer o~ bonding material on the bonding, corrugated lower face o~ the tread body; and e - puttlng a protective plastic sheet to wrap the said lower ~ace, to prevent oxidation o~ the adhesive layer during its storage.
The expo~ure to pot~ntial oxidatlon of the adhe~ive layer is a di advan~ageou6 feature ~hat ha~pers th~ ~ea~ibili~y o~ the said known proce~ , both under ~echnical and sconomical viewpoin~s, 03 2 :~ ~ 0 ~
even when counking with the re-usability of the stripe of rough cloth.
It iæ so the main scope of ~his invention to improve the said known process through the dropping of the use of th~ e~bossing stripe o~ rough cloth and o~ the filling in of a layer o~ liquid adhesive, thus enhancing the production of the ~read bodies by the elimination of ~he time con~uming operations of putting in place and xemoving the piece of c:Loth and of applying the oxidizable adhesiv~ layer.
Through intense research applicant has eventually found out what now is disclosed as the main object of khis invention, that all the said di~advantageou~ features l~ay be wiped out by substituting the adhesive liquid layer, whose application has demanded the corrugation o~ the tread body bonding face and preventing the use of a stripe o~ tough ~abric, by a self-adhesive, vulcanizable rubber layer which may eaæily bond the tire tr~ad onto the smooth surface o~ a tire carcass to ~e restored in ~hich the said self-bonding layer is co~pounded by 65 to 75% o~ natural rubber~ 15 to 30% of strengthening ~ineral pigments and 10 to 15 % of vulcanization reactants.
The improved process o~ this invention consists o~ :
~a) preparation o~ a layer of sel~-bonding, vulcanizable rubber composition made o~ 65 to 75% of natural rubber, 15 to 30% o~ strengthening mineral pi~ments selected among carbon black and silica , alone or combined~ with the altérnativ~ adding of pi~ment dyes, and from 10 to 15% of che~ical reactants o~ vulcanization selected among sulphur, thiurans, zinc oxides, sulfonamides and stearic acid;
~) aligning ans superimposing the ~read body on a stripe oP the said rubbar composition, with the same width (c) wrapping the said sel~-~o~ding lowQr layer with a thermopla~tic protetive sheet and o~
212~7~
(d~ submitting the said tread structure to pre~curing in a vulcanizer press.
Its is t~us obtained an out o~
the press re~dy to sell and use tread units which are delivered to the tire r~pair shopE; where by easily tearing off the protective plastic sheet, the unit being arranged as usual, on the known connecting layer placed on the smooth bonding face of the tire carcas~, the whole set being then vulcanized.
As an alternative way to carry out the improved proces~ o~
this invention the said protective pla~tic sheet may be wrapped around the said sel~-bonding rubber layer after the pre-curing o~ the tread structure/ by mechanical means instead of ~y thermal adherence in the pre-curing stage.
The pla~tic protective sheet is selected among those neutral materials which do not interact with the self-bonding rubber layer, being selected among polyester plastic films, poly~thylene film and polyester textile sheetsO
Yet another alternativ~ way to carry out the process o~
this invention consists o~:
(a) pre-curing the ~read body alone;
(b) applying on the bonding face thereof by any available means, like by thermofixin~ in an autoclave, the said self -bonding rubber layer and (c) wrapping of the said lower layer on the said plastic sheet Through the laboratory test, ASTM/D~413 it was measur~d a 20~ increase o~ the adhesiveness o the tread structure to the tire carcass when co~pared with the state of the art process as disclosed in the Patent Application BR/
8805122. By the said test a restored tire having a tire tread replaced in accordance with this invention, endured an air pressure between 80 and 100 p.s.i without showing any disengagement or loosening of any portion o~ the tire tr~ad section.
21'2~3 The same lab test carri~d out on a restored tire having the tire tread fastened in accordance with the process disclosed in the said ~R -8806122 patent application, reveled an endurance between 70 and 80 p.s.i.
Under international standards o~ quality , the said figure is set at a minimum level of 60 p.s.i what stresses the high performance and the unex]pected superior results obtained with the process o~ this invention.
As a further advantageous feature it may be stresséd the fact that by dropping the use of the chemical adhesive layer, the storing time is substantially lengthened provided that the risk of oxidation is no longer to be taken into account.
., ,, , ,,, ,, , ~,. .... .. ..
AND VULCANIZABLE RUBB:ER COMPOUND
The present invention relates to an improved process to manu~acture pre-cured tread s~ructures to replace worn out tire treads on a pneumatic carcaæs of a pneumatic tire to be restored in local tire repairing shops, a~ well as to a vulcanizable rubber compound to bo applied under said tre~d belt.
It is Xnown by the ~rt such as di~clo~ed in the Brazilian Patont Application S/N PI
8806122 ~corresponding to US patent application 393,126 ~iled on August 14, 1989) to improv~ the bonding o~ a pr~-cur~d tread body into the smoothed sur~ace of a pneumatic tire to be restored upon the full removal oP the worn out tire tread, in which the whole lower side of the tread body is provided with corrugation~ obtained in the pr~ curing proce~s o~ the tread body by means of a sheet o cour~e cloth embodied into the said lower face during the pre-curing stage in the vulcanizing press, the said pisce o~ cloth being stripped off before applying the layer o~ bonding material and then submittiny the tire body and the adhering new pre-cured tire tread to final vulcanization, in the tire repair shop.
In ~act, the said operation of ~irstly incorporating he piece of fabric onto tha lower face o~ t~e tread body through its pre-curing, during the manufacture o~ the tire tread unit to be supplied to the tire repair shops may give cause to some drawbacks due to ~he need o~ having the piece of cloth stripped ~rom the tread body to rev al th~ resulting corrugations embossed into th~ lower sur~ace thereo~ by the pressed rough cloth, at the very moment the new tread unt is to be bonded to th~ car~ass of the tire on which the restoration of the :
02 212~73 tread i~ to be performed.
A layer o~ proper bonding material is th~n applied on t,he said wrinkled lower surface of the tread body, fllling in all th~ grooves and a portion of tim~ is to be spent ~or the bonding fluid to dry out. Only then a rubber connecting layer is placed betwe0n the tread and the ti.re body to start the vulcanization of the tread structure.
In some places, lik~ in the United States, the manufa~turer does strip the piece o~
cloth th~re~rom soon after its pre-curing and then does apply the adhesive lay~r on the curru~ated surface and then shi~ld~ it o~f again~t oxida~ion by ~ean~ of a plastic sheet.
In all cas~s, though, th~ said ~take of the art by whic~ the e~bo~sement of the bonding sur~aa~ o~ the tread body i~ carr~ed out by m2an~ o~ a pi~ce of rough iabric, shows the main disadvantageous ~eature of not allowinq a mas~ produc~ion on accoun~ of the huge lo~ o~ time resulting ~rom ~he ~anual steps of:
a - aligning a~d superimposing the extruded ~read body on ~he shee~ o~ rough cloth;
b - taking the two supeximposed but still separate parts, to the pre-curinq pre ~ ~or the molding o~ the tread uni~;
c - stripping of~ the piece of cloth soon after th~ pre~
curing;
d - applying a layer o~ bonding material on the bonding, corrugated lower face o~ the tread body; and e - puttlng a protective plastic sheet to wrap the said lower ~ace, to prevent oxidation o~ the adhesive layer during its storage.
The expo~ure to pot~ntial oxidatlon of the adhe~ive layer is a di advan~ageou6 feature ~hat ha~pers th~ ~ea~ibili~y o~ the said known proce~ , both under ~echnical and sconomical viewpoin~s, 03 2 :~ ~ 0 ~
even when counking with the re-usability of the stripe of rough cloth.
It iæ so the main scope of ~his invention to improve the said known process through the dropping of the use of th~ e~bossing stripe o~ rough cloth and o~ the filling in of a layer o~ liquid adhesive, thus enhancing the production of the ~read bodies by the elimination of ~he time con~uming operations of putting in place and xemoving the piece of c:Loth and of applying the oxidizable adhesiv~ layer.
Through intense research applicant has eventually found out what now is disclosed as the main object of khis invention, that all the said di~advantageou~ features l~ay be wiped out by substituting the adhesive liquid layer, whose application has demanded the corrugation o~ the tread body bonding face and preventing the use of a stripe o~ tough ~abric, by a self-adhesive, vulcanizable rubber layer which may eaæily bond the tire tr~ad onto the smooth surface o~ a tire carcass to ~e restored in ~hich the said self-bonding layer is co~pounded by 65 to 75% o~ natural rubber~ 15 to 30% of strengthening ~ineral pigments and 10 to 15 % of vulcanization reactants.
The improved process o~ this invention consists o~ :
~a) preparation o~ a layer of sel~-bonding, vulcanizable rubber composition made o~ 65 to 75% of natural rubber, 15 to 30% o~ strengthening mineral pi~ments selected among carbon black and silica , alone or combined~ with the altérnativ~ adding of pi~ment dyes, and from 10 to 15% of che~ical reactants o~ vulcanization selected among sulphur, thiurans, zinc oxides, sulfonamides and stearic acid;
~) aligning ans superimposing the ~read body on a stripe oP the said rubbar composition, with the same width (c) wrapping the said sel~-~o~ding lowQr layer with a thermopla~tic protetive sheet and o~
212~7~
(d~ submitting the said tread structure to pre~curing in a vulcanizer press.
Its is t~us obtained an out o~
the press re~dy to sell and use tread units which are delivered to the tire r~pair shopE; where by easily tearing off the protective plastic sheet, the unit being arranged as usual, on the known connecting layer placed on the smooth bonding face of the tire carcas~, the whole set being then vulcanized.
As an alternative way to carry out the improved proces~ o~
this invention the said protective pla~tic sheet may be wrapped around the said sel~-bonding rubber layer after the pre-curing o~ the tread structure/ by mechanical means instead of ~y thermal adherence in the pre-curing stage.
The pla~tic protective sheet is selected among those neutral materials which do not interact with the self-bonding rubber layer, being selected among polyester plastic films, poly~thylene film and polyester textile sheetsO
Yet another alternativ~ way to carry out the process o~
this invention consists o~:
(a) pre-curing the ~read body alone;
(b) applying on the bonding face thereof by any available means, like by thermofixin~ in an autoclave, the said self -bonding rubber layer and (c) wrapping of the said lower layer on the said plastic sheet Through the laboratory test, ASTM/D~413 it was measur~d a 20~ increase o~ the adhesiveness o the tread structure to the tire carcass when co~pared with the state of the art process as disclosed in the Patent Application BR/
8805122. By the said test a restored tire having a tire tread replaced in accordance with this invention, endured an air pressure between 80 and 100 p.s.i without showing any disengagement or loosening of any portion o~ the tire tr~ad section.
21'2~3 The same lab test carri~d out on a restored tire having the tire tread fastened in accordance with the process disclosed in the said ~R -8806122 patent application, reveled an endurance between 70 and 80 p.s.i.
Under international standards o~ quality , the said figure is set at a minimum level of 60 p.s.i what stresses the high performance and the unex]pected superior results obtained with the process o~ this invention.
As a further advantageous feature it may be stresséd the fact that by dropping the use of the chemical adhesive layer, the storing time is substantially lengthened provided that the risk of oxidation is no longer to be taken into account.
., ,, , ,,, ,, , ~,. .... .. ..
Claims (7)
1. An process improved of manufacture of a pre-cured tread body to be bonded to a tire carcass , without using textile means to corrugate the bonding face of the tread body and without the use of chemical adhesive layer filling in the grooves on the said surface, consisting of:
- preparing a rubber body having a lower smooth bonding face - pre-curing the said rubber body in a vulcanizer press to wold its upper, working surface, into a tire tread.
- bonding the said tread body onto a tire carcass by means of a vulcanizable intermediate connecting rubber layer and - a vulcanizing the resulting assembly,characterized by the fact that it consists of:
(a) a vulcanizable self-adhesive rubber composition layer is prepared, being compounded by 65 to 75% of natural rubber 15 to 30% of strengthening mineral pigments and by 10 to 15% of chemical reactants of vulcanization having the same width of the tread body;
(b) the tread body is then aligned and superimposed on the said self-adhesive layer (c) the said self adhesive rubber layer is then wrapped by a lowermost protective plastic film and (d) the tread assembly is then submitted to pre-curing in a vulcanizer press to obtain a ready -to - use tire tread for replacing the worn out treads of restorable tires.
- preparing a rubber body having a lower smooth bonding face - pre-curing the said rubber body in a vulcanizer press to wold its upper, working surface, into a tire tread.
- bonding the said tread body onto a tire carcass by means of a vulcanizable intermediate connecting rubber layer and - a vulcanizing the resulting assembly,characterized by the fact that it consists of:
(a) a vulcanizable self-adhesive rubber composition layer is prepared, being compounded by 65 to 75% of natural rubber 15 to 30% of strengthening mineral pigments and by 10 to 15% of chemical reactants of vulcanization having the same width of the tread body;
(b) the tread body is then aligned and superimposed on the said self-adhesive layer (c) the said self adhesive rubber layer is then wrapped by a lowermost protective plastic film and (d) the tread assembly is then submitted to pre-curing in a vulcanizer press to obtain a ready -to - use tire tread for replacing the worn out treads of restorable tires.
2. The process as per claim 1 in which alternatively the said wraping lower plastic film is arranged on place by mechanical roller means after the pre-curing of the tread body with the associated self-adhesive layer.
3. An improved process of manufacture of a pre-cured tread body to be bonded to a tire carcass without using textile means to corrugate the bonding face of the tread body and without the use of chemical adhesive layer filling in the grooves on the said surface, consisting of:
- preparing a rubber body having a lower smooth bonding face, - pre-curing the said rubber body in a vulcanizer press to mold its upper working surface, into a tire tread, - bonding said tread body onto a tire carcass be means of a vulcanizable intermediate connecting rubber layer, and, - vulcanizing the resulting assembly characterized by the fact that it consists of:
(a) preparing a vulcanizable self-bonding rubber sheet compoundeed by 65 to 75% of natural rubber , 15 to 30% of strengthening mineral pigments and by 10 to 15% of chemical reactants of vulcanization having the same width of the said tread body (b) alighming and superimposing the said pre-cured tread body on the said self - bonding rubber sheet (c) fastening the said lower layer to the supeimposed pre-cured body by heating the assembly in an autoclave and (d) wrapping up the said lower layer with a protective plastic sheet applied by means of mechanical roller means
- preparing a rubber body having a lower smooth bonding face, - pre-curing the said rubber body in a vulcanizer press to mold its upper working surface, into a tire tread, - bonding said tread body onto a tire carcass be means of a vulcanizable intermediate connecting rubber layer, and, - vulcanizing the resulting assembly characterized by the fact that it consists of:
(a) preparing a vulcanizable self-bonding rubber sheet compoundeed by 65 to 75% of natural rubber , 15 to 30% of strengthening mineral pigments and by 10 to 15% of chemical reactants of vulcanization having the same width of the said tread body (b) alighming and superimposing the said pre-cured tread body on the said self - bonding rubber sheet (c) fastening the said lower layer to the supeimposed pre-cured body by heating the assembly in an autoclave and (d) wrapping up the said lower layer with a protective plastic sheet applied by means of mechanical roller means
4. The process as per claim 1,2 and 3 in which the said strengthening mineral pigments are selected among carbon black and silica alone or combined,
5. the process as per claim 4 in which to the carbon black and silica it may be added pigment dyes.
6. The process as per claim 1 and 2 in which the said reactants of vulcanization are selected among sulphur, sulfonamides, thiurans, zinc oxides and stearic acid.
7. The process as per claim 1 and 2 is which the said protective plastic film is selected among polyester plastic, polyethylene sheets and polyester fabric.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI9300894 | 1993-03-30 | ||
| BR9300894A BR9300894A (en) | 1993-03-30 | 1993-03-30 | Improved process for the production of pre-cured tread for retreading tires and vulcanizable rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2120473A1 true CA2120473A1 (en) | 1994-10-01 |
Family
ID=4055995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2120473 Pending CA2120473A1 (en) | 1993-03-30 | 1994-03-29 | Process to manufacture pre-cured tread and vulcanizable rubber compound |
Country Status (3)
| Country | Link |
|---|---|
| BR (1) | BR9300894A (en) |
| CA (1) | CA2120473A1 (en) |
| MX (1) | MXPA94002118A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0730950A2 (en) * | 1995-03-08 | 1996-09-11 | Bandag Inc. | Retreaded tires and method for making the same without spray cement |
| US6758931B1 (en) | 2000-01-27 | 2004-07-06 | Bandag, Incorporated | Method and apparatus for applying tire tread for a retread tire |
| US6899778B1 (en) | 2000-01-27 | 2005-05-31 | Bandag Incorporated | Method and apparatus for preparing tire tread for a retread tire |
-
1993
- 1993-03-30 BR BR9300894A patent/BR9300894A/en active IP Right Review Request
-
1994
- 1994-03-23 MX MX9402118A patent/MXPA94002118A/en unknown
- 1994-03-29 CA CA 2120473 patent/CA2120473A1/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0730950A2 (en) * | 1995-03-08 | 1996-09-11 | Bandag Inc. | Retreaded tires and method for making the same without spray cement |
| EP0730950A3 (en) * | 1995-03-08 | 1997-04-16 | Bandag Inc | Retreaded tires and method for making the same without spray cement |
| US6368439B1 (en) | 1995-03-08 | 2002-04-09 | Bandag Licensing Corporation | Retreaded tires and method for making the same without spray cement |
| US6758931B1 (en) | 2000-01-27 | 2004-07-06 | Bandag, Incorporated | Method and apparatus for applying tire tread for a retread tire |
| US6899778B1 (en) | 2000-01-27 | 2005-05-31 | Bandag Incorporated | Method and apparatus for preparing tire tread for a retread tire |
Also Published As
| Publication number | Publication date |
|---|---|
| MXPA94002118A (en) | 2002-06-18 |
| BR9300894A (en) | 1994-11-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead | ||
| FZDC | Correction of dead application (reinstatement) |