GB1479997A - Manufacture of slide fastener control slide stop studs - Google Patents
Manufacture of slide fastener control slide stop studsInfo
- Publication number
- GB1479997A GB1479997A GB9333/75A GB933375A GB1479997A GB 1479997 A GB1479997 A GB 1479997A GB 9333/75 A GB9333/75 A GB 9333/75A GB 933375 A GB933375 A GB 933375A GB 1479997 A GB1479997 A GB 1479997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tapes
- face
- tool
- plastics
- stop studs
- 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.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 229920003023 plastic Polymers 0.000 abstract 8
- 239000004033 plastic Substances 0.000 abstract 8
- 239000000463 material Substances 0.000 abstract 7
- 230000008878 coupling Effects 0.000 abstract 4
- 238000010168 coupling process Methods 0.000 abstract 4
- 238000005859 coupling reaction Methods 0.000 abstract 4
- 238000010438 heat treatment Methods 0.000 abstract 3
- 210000000988 bone and bone Anatomy 0.000 abstract 1
- 230000001788 irregular Effects 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/24—Details
- A44B19/36—Means for permanently uniting the stringers at the end; Means for stopping movement of slider at the end
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/42—Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00
- A44B19/60—Applying end stops upon stringer tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
- B29C66/326—Shaping the burr, e.g. by the joining tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/346—Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
- B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
- B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2005/00—Elements of slide fasteners
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Slide Fasteners (AREA)
Abstract
1479997 Sliding clasp fasteners SOC PRESTIL SA 6 March 1975 [12 March 1974] 9333/75 Heading E2S A method of making stop studs for the control slide of slide fasteners comprising coupling elements 5 in each row made of plastics filament forming a sequence of sinuous configurations such as helices or meanders, said filament being applied according to the type of elements either on a single face of the corresponding carrier tape 2 or straddlewise on both faces thereof, is characterised in that said stop studs are formed on one face of the carrier tapes 2, 2 by combining an additional external supply of plastics material to said one face with a partial flow, through the tapes, of plastics material constituting initially the coupling elements registering with each other on the other face of said tapes, and that, in the case of a helix-type slide fastener, said additional external supply of plastics material is applied to the faces opposite those carrying said elements. According to the invention also the said application is carried out jointly with the application of pressure and localized heating or, instead of said heating, with the action of supersonic vibration in order to cause the plastics material of said coupling elements located on said other faces of said tapes to melt and flow through the texture of said tapes. As shown, a continuous fastener chain 8 with coupling elements 5 in the form of a plastics helical filament 1 secured to one face 2 of each carrier tape 3 of woven form, is fed, at intervals, in the direction F 3 , Fig. 1, with its plain face 4 uppermost, along an anvil 7. During each stationary period of the chain 8 an end portion of a plastics rod 12 is fed from a device 13 across the chain in the direction F 3 whereupon a heated punch 6 is lowered onto the chain, the punch 6 having a sharp ridge 11 adapted to form a slit between the two moulded stop studs, and two cavities 10 into which the rod material is pressed to form the pair of stop studs 14 on the top surfaces 4 of the tapes 3. The tool 6 also melts the turns of the filaments therebeneath which, due to the pressure of the tool, seeps through the interstices, and meshes, of both of the tapes 3 in the form of irregular streamlets 15, Fig. 4, which thoroughly mix with the rod material. The melted turns of filament remaining on the under face 2 of the tapes 3 form small plates 16- which are integral with the streamlets 15 and provide a riveting-type anchorage of the stop studs 14. The descending tool 6 first cuts off the rod end portion and then forms a slit between the two plates 16. The tool ridge 11 may be replaced by a shaped configuration, Fig. 6, to provide an oval recess 20, Fig. 6, which has a duct, not shown, to carry off excess plastics material. The same procedure is carried out for tapes with meander-type filaments (1a, 5a) which straddle the edges of the tapes (3a, 3a) Figs. 11-15, not shown. The localised heating of the tool may be replaced by the action of supersonic vibration; the tape ends may be bone perforations formed therein; and the cutting ridge 15 may be omitted from the tool when the fastener chain is fed across the anvil in an open condition. The melting points of the filaments 1 and the rod 12 should preferably be closely related.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7408334A FR2263721B1 (en) | 1974-03-12 | 1974-03-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1479997A true GB1479997A (en) | 1977-07-13 |
Family
ID=9136172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9333/75A Expired GB1479997A (en) | 1974-03-12 | 1975-03-06 | Manufacture of slide fastener control slide stop studs |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2263721B1 (en) |
GB (1) | GB1479997A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005092138A1 (en) * | 2004-03-24 | 2005-10-06 | Supreme Plastics Holdings Limited | Zipper end sealing |
US8091187B2 (en) | 2007-02-27 | 2012-01-10 | Ykk Corporation | Zip fastener end stop |
CN112644027A (en) * | 2019-10-10 | 2021-04-13 | Ykk株式会社 | Bottom stop forming device and bottom stop forming method for slide fastener |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5568306A (en) * | 1978-11-16 | 1980-05-23 | Yoshida Kogyo Kk | Method and apparatus for preventing fray of slide fastener |
-
1974
- 1974-03-12 FR FR7408334A patent/FR2263721B1/fr not_active Expired
-
1975
- 1975-03-06 GB GB9333/75A patent/GB1479997A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005092138A1 (en) * | 2004-03-24 | 2005-10-06 | Supreme Plastics Holdings Limited | Zipper end sealing |
US8091187B2 (en) | 2007-02-27 | 2012-01-10 | Ykk Corporation | Zip fastener end stop |
CN112644027A (en) * | 2019-10-10 | 2021-04-13 | Ykk株式会社 | Bottom stop forming device and bottom stop forming method for slide fastener |
Also Published As
Publication number | Publication date |
---|---|
FR2263721A1 (en) | 1975-10-10 |
FR2263721B1 (en) | 1978-01-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3445915A (en) | Method of producing folded thermoplastic strips for sliding clasp fasteners | |
ES265327U (en) | Two strip materials used for forming fasteners. | |
CA1049260A (en) | Method for making ribbons curlable in a cockade fashion and article produced thereby | |
US2242794A (en) | Method of producing separable fasteners | |
CA1079046A (en) | Method of manufacturing slide fasteners | |
US2895170A (en) | Method of making adjustable fastener track | |
EP1048239A3 (en) | Slide fastener chain, method and apparatus for forming and thereof | |
US2638642A (en) | Sealing strip | |
GB1479997A (en) | Manufacture of slide fastener control slide stop studs | |
GB1146056A (en) | Improvements in or relating to separable sliding clasp fasteners and their manufacture | |
FR2469483B1 (en) | PROCESS FOR MANUFACTURING FABRIC, IN PARTICULAR A TAPE, WEAVING MATERIAL FOR CARRYING OUT THIS METHOD AND FABRIC THUS OBTAINED | |
ES8301129A1 (en) | Method and apparatus for manufacturing slide fastener coupling elements. | |
CA1079045A (en) | Method of manufacturing slide fasteners | |
US4110890A (en) | Method of manufacturing slide fasteners | |
US3485691A (en) | Method of sealing the ends of zipper lengths cut from a continuous fastener chain | |
GB1143825A (en) | ||
GB1156826A (en) | Improvements in or relating to Sliding Clasp Fasteners. | |
US4241489A (en) | Method of removing fastening elements from woven tape | |
US2519330A (en) | Method of cutting woven plastic to form a displaced edge | |
US3800394A (en) | Method of making slide fastener from continuous chain | |
US3533140A (en) | Slide fastener manufacture | |
GB1270179A (en) | Method of making end stops for sliding clasp fasteners | |
GB1206321A (en) | Improvements in or relating to separable fastener elements | |
GB1504665A (en) | Coupling element for sliding clasp fastener and method of making the same | |
US2969029A (en) | Method of producing continuous stringer workpieces with continuous covering members thereon |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |