Patent US3672026A successfully refreshed from Google Patents.
US3672026A
Expired / Lapsed
US
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Apparatus for developing wound coils for electromagnetic devices
Assignee: General Electric Co
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Filing: 1970-05-11
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Granted: 1972-06-27
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Expires: 1990-05-11
Abstract
Abstract Apparatus for developing electrical coil groups formed of a number of coils in a coil group-accommodating member for ultimate transfer into selected slots of a magnetic core. The coil groupaccommodating member is supported adjacent a non-collapsible, longitudinally movable coil form in position to receive the coil group. The coils in each coil group are developed by winding turns of a given coil on the non-collapsible form and concurrently moving some of the turns from the form into the accommodating member where the individual coil groups are finally developed. The non-collapsible coil form is periodically moved longitudinally to produce coils of differing spans during the development of each coil group.
Inventors
- 👤 Arthur S Cutler
- 👤 Dallas F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:40
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/06; H02K15/062; H02K15/065; H02K15/067; H02K15/068; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071; Y10T29/49073; Y10T29/53; Y10T29/5313; Y10T29/53143; Y10T29/53187; Y10T29/53313; Y10T29/53348
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
294 words
Apparatus for developing coils comprising a coil form assembly including a vertically disposed mounting plate, an upper coil form portion affixed to said mounting plate and projecting forwardly therefrom, said upper coil form portion having an upper surface divided into a plurality of vertically displaced arcuate sections, said plurality of vertically displaced arcuate sections being joined by inclined arcuate sections adapted to have turns of wire wound thereon, said vertically displaced arcuate sections having a common center of curvature which is substantially perpendicular to said vertical mounting plate, and said inclined arcuate sections having centers of curvature which are generally parallel and which intersect the common center of curvature at an angle of approximately 45*, a lower coil form portion adjustably mounted on said mounting plate, said lower coil form portion being substantially coextensive with said upper coil form portion and having a lower surface divided into a plurality of vertically displaced arcuate sections corresponding to the plurality of vertically displaced arcuAte sections of said upper coil form portion, the arcuate sections of said lower coil form portion having a common center of curvature intersecting said mounting plate at an angle of approximately 85* and intersecting said common center of curvature of said vertically displaced arcuate sections of said upper coil form portion at an angle of approximately 5*, said corresponding vertically displaced arcuate sections of said upper and lower coil form portions each comprising a winding station for forming a different size coil of wire; means for placing turns of wire on said inclined arcuate sections; a transfer magazine having coil-receiving means; and means located between said upper and lower coil form portions and movable longitudinally therebetween for transferring coils wound upon said winding stations into the coil-receiving means of said transfer magazine.
Claim 2
Dependent Claim
294 words
Apparatus for developing coils comprising a coil form assembly including a vertically disposed mounting plate, an upper coil form portion affixed to said mounting plate and projecting forwardly therefrom, said upper coil form portion having an upper surface divided into a plurality of vertically displaced arcuate sections, said plurality of vertically displaced arcuate sections being joined by inclined arcuate sections adapted to have turns of wire wound thereon, said vertically displaced arcuate sections having a common center of curvature which is substantially perpendicular to said vertical mounting plate, and said inclined arcuate sections having centers of curvature which are generally parallel and which intersect the common center of curvature at an angle of approximately 45*, a lower coil form portion adjustably mounted on said mounting plate, said lower coil form portion being substantially coextensive with said upper coil form portion and having a lower surface divided into a plurality of vertically displaced arcuate sections corresponding to the plurality of vertically displaced arcuAte sections of said upper coil form portion, the arcuate sections of said lower coil form portion having a common center of curvature intersecting said mounting plate at an angle of approximately 85* and intersecting said common center of curvature of said vertically displaced arcuate sections of said upper coil form portion at an angle of approximately 5*, said corresponding vertically displaced arcuate sections of said upper and lower coil form portions each comprising a winding station for forming a different size coil of wire; means for placing turns of wire on said inclined arcuate sections; a transfer magazine having coil-receiving means; and means located between said upper and lower coil form portions and movable longitudinally therebetween for transferring coils wound upon said winding stations into the coil-receiving means of said transfer magazine.
Claim 3
Dependent Claim
181 words
Apparatus for developing distributively wound coil groups of wire for use in an electromagnetic device, each coil group having at least two serially connected coils, the apparatus comprising in combination: a non-collapsing stepped coil form including a first portion having a plurality of arcuate steps of increasingly larger size and a second portion having a plurality of arcuate steps corresponding to the arcuate steps of said first portion, said first and second coil form portions being spaced to define slot means therebetween, means for placing turns of wire on pairs of corresponding arcuate steps of said first and second coil form portions thereby to form a plurality of serially connected coils of different size, a coil-receiving magazine supported adjacent said coil form, means for moving the magazine and the coil form relative to one another for locating a portion of said magazine in said slot means to receive at least some of the turns of the serially connected coils as other of the turns are being wound on said coil form, and means for transferring the coils fully into said magazine.
Claim 4
Dependent Claim
181 words
Apparatus for developing distributively wound coil groups of wire for use in an electromagnetic device, each coil group having at least two serially connected coils, the apparatus comprising in combination: a non-collapsing stepped coil form including a first portion having a plurality of arcuate steps of increasingly larger size and a second portion having a plurality of arcuate steps corresponding to the arcuate steps of said first portion, said first and second coil form portions being spaced to define slot means therebetween, means for placing turns of wire on pairs of corresponding arcuate steps of said first and second coil form portions thereby to form a plurality of serially connected coils of different size, a coil-receiving magazine supported adjacent said coil form, means for moving the magazine and the coil form relative to one another for locating a portion of said magazine in said slot means to receive at least some of the turns of the serially connected coils as other of the turns are being wound on said coil form, and means for transferring the coils fully into said magazine.
Claim 5
Dependent Claim
209 words
Apparatus for developing distributively wound coil groups of wire for use in an electromagnetic device, each coil group having at least two serially connected coils, the apparatus comprising in combination: a non-collapsing stepped coil form having a forward end including a first portion having a plurality of displaced arcuate steps of increasingly larger size as the first portion extends away from the forward end, joined by inclined arcuate sections adapted to have turns of wire wound thereon and a second portion having a plurality of arcuate steps corresponding to the arcuate steps of said first portion, said first and second coil form portions being spaced to define slot means therebetween, means for placing turns of wire on a plurality of pairs of corresponding arcuate steps of said first and second coil form portions thereby to form a plurality of serially connected coils of different sizes, a coil-receiving assembly supported adjacent said coil form, means for moving the coil-receiving assembly and the coil form relative to one another for locating a portion of said coil-receiving assembly in said slot means to receive at least some of the turns of the serially connected coils as other of the turns are being wound on associated inclined arcuate sections of said coil form.
Claim 6
Dependent Claim
209 words
Apparatus for developing distributively wound coil groups of wire for use in an electromagnetic device, each coil group having at least two serially connected coils, the apparatus comprising in combination: a non-collapsing stepped coil form having a forward end including a first portion having a plurality of displaced arcuate steps of increasingly larger size as the first portion extends away from the forward end, joined by inclined arcuate sections adapted to have turns of wire wound thereon and a second portion having a plurality of arcuate steps corresponding to the arcuate steps of said first portion, said first and second coil form portions being spaced to define slot means therebetween, means for placing turns of wire on a plurality of pairs of corresponding arcuate steps of said first and second coil form portions thereby to form a plurality of serially connected coils of different sizes, a coil-receiving assembly supported adjacent said coil form, means for moving the coil-receiving assembly and the coil form relative to one another for locating a portion of said coil-receiving assembly in said slot means to receive at least some of the turns of the serially connected coils as other of the turns are being wound on associated inclined arcuate sections of said coil form.
Claim 7
Dependent Claim
37 words
The apparatus of claim 2 in which the inclined arcuate sections adapted to have turns of wire wound thereon have centers of curvature which are generally parallel and intersect a common center at an angle approximately 45*.
Claim 8
Dependent Claim
239 words
Apparatus for developing coils comprising a coil form assembly including a mounting plate, a first coil form portion affixed to said mounting plate and projecting forwardly thereform, said first coil form portion having an outer surface divided into a plurality of displaced arcuate sections, said plurality of displaced arcuate sectons being joined by inclined arcuate sections adapted to have turns of wire wound thereon, said displaced arcuate sections generally having a common center of curvature, and said inclined arcuate sections having centers of curvature which are generally parallel and which intersect the common center of curvature, a second coil form portion mounted on said mounting plate, said second coil form portion being substantially coextensive with said first coil form portion and having an outer surface divided into a plurality of displaced arcuate sections corresponding to the plurality of displaced arcuate sections of said first coil form portion, the arcuate sections of said second coil form portion having a common center of curvature intersecting said mounting plate at a preselected angle, said corresponding arcuate sections of said first and second coil form portions each including a winding station for forming a different size coil of wire; means for placing turns of wire on said inclined arcuate sections; a coil-receiving assembly having coil-receiving means; and means located between said first and second coil form portions and movable longitudinally therebetween for transferring coils wound upon said winding stations into the coil-receiving means.
Claim 9
Dependent Claim
239 words
Apparatus for developing coils comprising a coil form assembly including a mounting plate, a first coil form portion affixed to said mounting plate and projecting forwardly thereform, said first coil form portion having an outer surface divided into a plurality of displaced arcuate sections, said plurality of displaced arcuate sectons being joined by inclined arcuate sections adapted to have turns of wire wound thereon, said displaced arcuate sections generally having a common center of curvature, and said inclined arcuate sections having centers of curvature which are generally parallel and which intersect the common center of curvature, a second coil form portion mounted on said mounting plate, said second coil form portion being substantially coextensive with said first coil form portion and having an outer surface divided into a plurality of displaced arcuate sections corresponding to the plurality of displaced arcuate sections of said first coil form portion, the arcuate sections of said second coil form portion having a common center of curvature intersecting said mounting plate at a preselected angle, said corresponding arcuate sections of said first and second coil form portions each including a winding station for forming a different size coil of wire; means for placing turns of wire on said inclined arcuate sections; a coil-receiving assembly having coil-receiving means; and means located between said first and second coil form portions and movable longitudinally therebetween for transferring coils wound upon said winding stations into the coil-receiving means.
Claim 10
Dependent Claim
34 words
The apparatus of claim 5 having means for periodically indexing the coil-receiving assembly and coil form assembly relative to one another after a selected number of coils have been received in the coil-receiving assembly.
Claim 11
Dependent Claim
121 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: coil turn-forming means having at least a first section defining the size of the turns formed and at least a second section inclined with respect to said first section; winding means for generating turns of wire about said second section so that previously generated turns move along said first section as subsequent turns are generated; and a coil group-receiving means having a plurality of spaced apart blades; said coil group-receiving means being positioned with predetermined blades adjacent said first section of said coil turn-forming means for receiving therebetween at least some of the previously generated turns as subsequent turns are generated.
Claim 12
Dependent Claim
121 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: coil turn-forming means having at least a first section defining the size of the turns formed and at least a second section inclined with respect to said first section; winding means for generating turns of wire about said second section so that previously generated turns move along said first section as subsequent turns are generated; and a coil group-receiving means having a plurality of spaced apart blades; said coil group-receiving means being positioned with predetermined blades adjacent said first section of said coil turn-forming means for receiving therebetween at least some of the previously generated turns as subsequent turns are generated.
Claim 13
Dependent Claim
126 words
Apparatus as set forth in claim 7 wherein: said coil turn-forming means has a plurality of coil turn-forming stations; each of said coil turn-forming stations having a first section and a second second section with said first section of each of said coil turn-forming stations defining a turn size different than said first section of other of said coil turn-forming stations, and including means for providing relative motion between said coil turn-forming means, said winding means and said coil group-receiving means for sequentially generating turns of wire at different coil turn-forming stations and receiving at least some of the turns previously generated at any coil turn-forming station between sequentially selected blades of said coil group-receiving means as subsequent turns are generated at that coil turn-forming station.
Claim 14
Dependent Claim
36 words
Apparatus as set forth in claim 7: further including stripper means effective to insure that any turns remaining on said coil turn-forming means at the completion of turn generation are moved to said coil group-receiving means.
Claim 15
Dependent Claim
58 words
Apparatus as set forth in claim 7 wherein said coil turn-forming means includes at least first and second spaced apart form portions; said first and second form portions together forming said first and second sections; said coil group-receiving means being positionable within the space between said first and second portions for positioning predetermined blades adjacent said first section.
Claim 16
Dependent Claim
129 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: noncollapsible coil turn-forming means; winding means for generating turns of wire about said noncollapsible coil turn-forming means; and coil group-receiving means having coil-receiving slots adapted to be disposed in close proximity to said noncollapsible coil turn-forming means for receiving generated turns of wire to form at least a coil; said noncollapsible coil turn-forming means, said winding means and said coil group-receiving means being so formed and positioned relative to one another that said winding means generates turns of wire about said non-collapsible coil turn-forming means and at least some previously generated turns are received in the coil-receiving slots of said coil group-receiving means as subsequent turns are being generated.
Claim 17
Dependent Claim
129 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: noncollapsible coil turn-forming means; winding means for generating turns of wire about said noncollapsible coil turn-forming means; and coil group-receiving means having coil-receiving slots adapted to be disposed in close proximity to said noncollapsible coil turn-forming means for receiving generated turns of wire to form at least a coil; said noncollapsible coil turn-forming means, said winding means and said coil group-receiving means being so formed and positioned relative to one another that said winding means generates turns of wire about said non-collapsible coil turn-forming means and at least some previously generated turns are received in the coil-receiving slots of said coil group-receiving means as subsequent turns are being generated.
Claim 18
Dependent Claim
236 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: non-collapsible coil turn-forming means; winding means for generating turns of wire about said non-collapsible coil turn-forming means; and coil group-receiving means for receiving generated turns of wire to form at least a coil; said non-collapsible coil turn-forming means, said winding means and said coil group-receiving means being so formed and positioned relative to one another that said winding means generates turns of wire about said non-collapsible coil turn-forming means and at least some previously generated turns are received in said coil group-receiving means as subsequent turns are being generated, said non-collapsible coil turn-forming means further including a plurality of coil turn-forming stations, with each station defining a turn size different than other stations; said coil group-receiving means further including a plurality of spaced apart coil-receiving slots; and means for providing relative movement between said coil turn-forming means, said winding means and said coil group-receiving means for sequentially positioning said winding means and selected ones of said coil-receiving slots in alignment with selected ones of said coil turn-forming stations so that turns of wire are generated sequentially at selected coil turn-forming stations and at least some of the turns previously generated at each selected coil turn-forming station are received in corresponding slots in said coil group-receiving means as subsequent turns are generated at that coil turn-forming station.
Claim 19
Dependent Claim
236 words
Apparatus for developing at least a coil of electrically conductive wire for use in a magnetic core, said apparatus including: non-collapsible coil turn-forming means; winding means for generating turns of wire about said non-collapsible coil turn-forming means; and coil group-receiving means for receiving generated turns of wire to form at least a coil; said non-collapsible coil turn-forming means, said winding means and said coil group-receiving means being so formed and positioned relative to one another that said winding means generates turns of wire about said non-collapsible coil turn-forming means and at least some previously generated turns are received in said coil group-receiving means as subsequent turns are being generated, said non-collapsible coil turn-forming means further including a plurality of coil turn-forming stations, with each station defining a turn size different than other stations; said coil group-receiving means further including a plurality of spaced apart coil-receiving slots; and means for providing relative movement between said coil turn-forming means, said winding means and said coil group-receiving means for sequentially positioning said winding means and selected ones of said coil-receiving slots in alignment with selected ones of said coil turn-forming stations so that turns of wire are generated sequentially at selected coil turn-forming stations and at least some of the turns previously generated at each selected coil turn-forming station are received in corresponding slots in said coil group-receiving means as subsequent turns are generated at that coil turn-forming station.
Claim 20
Dependent Claim
55 words
Apparatus as set forth in claim 11 wherein said turn-forming means defines a slot and wherein said apparatus further includes stripper means movably mounted within said slot effective to insure that any turns remaining on said coil turn-forming means at the completion of turn generation are moved into coil-receiving slots of said coil group-receiving means.
Claim 21
Dependent Claim
142 words
Apparatus for developing at least one coil of electrically conductive wire in a coil group for use in an electromagnetic device, the apparatus comprising: first means for forming turns; second means in the vicinity of said first means for generating successive turns of wire about the first means; third means having spaces therein for accommodating the generated turns of wire; and fourth means for removably maintaining said first means and the spaces of said third means in a relative aligned position in close proximity relative to one another such that the third means is positioned with the spaces in alignment to receive at least some of the turns as subsequent turns are being generated about the first means and in a second relative position in which said first means and the spaces of said third means are no longer in close proximity.
Claim 22
Dependent Claim
142 words
Apparatus for developing at least one coil of electrically conductive wire in a coil group for use in an electromagnetic device, the apparatus comprising: first means for forming turns; second means in the vicinity of said first means for generating successive turns of wire about the first means; third means having spaces therein for accommodating the generated turns of wire; and fourth means for removably maintaining said first means and the spaces of said third means in a relative aligned position in close proximity relative to one another such that the third means is positioned with the spaces in alignment to receive at least some of the turns as subsequent turns are being generated about the first means and in a second relative position in which said first means and the spaces of said third means are no longer in close proximity.
Claim 23
Dependent Claim
29 words
Apparatus as set forth in claim 14 in which said fourth means removably maintains said first and third means in telescoping relation as the subsequent turns are being generated.
Claim 24
Dependent Claim
144 words
Apparatus for developing at least one coil of electrically conductive wire in a coil group for use in an electromagnetic device, the apparatus comprising: first means for forming turns including a plurality of adjacent stations for forming coils of different sizes; second means in the vicinity of said first means for generating successive turns of wire about the first means; third means for accommodating the generated turns of wire, and defining a number of spaces which are sequentially aligned with the different stations for receiving selected porTions of the turns as subsequent turns are being generated about the first means, and fourth means for removably maintaining said first means and third means in close proximity relative to one another such that the third means is positioned to receive at least some of the turns as subsequent turns are being generated about the first means.
Claim 25
Dependent Claim
144 words
Apparatus for developing at least one coil of electrically conductive wire in a coil group for use in an electromagnetic device, the apparatus comprising: first means for forming turns including a plurality of adjacent stations for forming coils of different sizes; second means in the vicinity of said first means for generating successive turns of wire about the first means; third means for accommodating the generated turns of wire, and defining a number of spaces which are sequentially aligned with the different stations for receiving selected porTions of the turns as subsequent turns are being generated about the first means, and fourth means for removably maintaining said first means and third means in close proximity relative to one another such that the third means is positioned to receive at least some of the turns as subsequent turns are being generated about the first means.
Claim 26
Dependent Claim
128 words
Apparatus for developing at least two coils of electrically conductive wire for use in a magnetic core, said apparatus including: coil turn-forming means having at least two axially spaced apart sections for defining turns of different sizes; said two spaced apart sections each respectively having portions defining first and second locations separated by an elongated area of generally uniform, transverse cross-sectional configuration; winding means for generating turns of wire about said coil turn-forming means in the vicinity of said first location of each section; and means for moving each turn longitudinally of said coil turn-forming means as it is generated so that previously generated turns are moved generally longitudinally in a direction from said first location toward said second location of each section as subsequent turns are generated.
Claim 27
Dependent Claim
128 words
Apparatus for developing at least two coils of electrically conductive wire for use in a magnetic core, said apparatus including: coil turn-forming means having at least two axially spaced apart sections for defining turns of different sizes; said two spaced apart sections each respectively having portions defining first and second locations separated by an elongated area of generally uniform, transverse cross-sectional configuration; winding means for generating turns of wire about said coil turn-forming means in the vicinity of said first location of each section; and means for moving each turn longitudinally of said coil turn-forming means as it is generated so that previously generated turns are moved generally longitudinally in a direction from said first location toward said second location of each section as subsequent turns are generated.
Claim 28
Dependent Claim
22 words
Apparatus as set forth in claim 17 further including means for removing a completely generated coil longitudinally of said coil form means.
Claim 29
Dependent Claim
141 words
Apparatus for developing at least two coils of electrically conductive wire for use in a magnetic core, said apparatus including: a coil form having a distal end and a plurality of spacially separated steps for defining turns of different sizes; winding means; means for effecting relative motion between said winding means and said coil form, with said steps being sequentially placed in alignment with said winding means for generating turns of wire to produce coils of at least two different sizes; turn-receiving means disposed adjacent the coil form in alignment with the separated steps; said coil form being dimensioned so that previously generated turns move toward said distal end of said coil form for each step and selectively into the turn-receiving means as subsequent turns are generated to permit the turn-receiving means to hold coils of at least two different sizes.
Claim 30
Dependent Claim
141 words
Apparatus for developing at least two coils of electrically conductive wire for use in a magnetic core, said apparatus including: a coil form having a distal end and a plurality of spacially separated steps for defining turns of different sizes; winding means; means for effecting relative motion between said winding means and said coil form, with said steps being sequentially placed in alignment with said winding means for generating turns of wire to produce coils of at least two different sizes; turn-receiving means disposed adjacent the coil form in alignment with the separated steps; said coil form being dimensioned so that previously generated turns move toward said distal end of said coil form for each step and selectively into the turn-receiving means as subsequent turns are generated to permit the turn-receiving means to hold coils of at least two different sizes.
Claim 31
Dependent Claim
24 words
Apparatus as set forth in claim 19 further including means for removing a completely generated coil over said distal end of said coil form.
Claim 32
Dependent Claim
238 words
Apparatus for developing a plurality of coil groups formed of electrically conductive wire material for use in an electromagnetic device and for sequentially receiving a first coil group after development thereof prior to developing at least a second coil group, the apparatus comprising: coil turn-forming means; winding means for generating turns of wire about said coil turn-forming means to provide the plurality of coil groups; a coil group-receiving assembly having a number of sets of angularly spaced apart coil-receiving slots for temporarily accommodating a plurality of coil groups in angularly spaced relation for ultimate insertion into a magnetic core of the electromagnetic device; means for maintaining a preselected set of spaced apart coil-receiving slots of the coil group-receiving assembly and coil turn-forming means in adjacent aligned relation such that the preselected set of slots is in position to receive directly the first coil group from said coil turn-forming means prior to developing at least the second coil group and for sequentially indexing at least one other set of angularly spaced apart coil-receiving slots and the coil turn-forming means into the adjacent aligned relation so that said at least one other set of slots is thereafter in position to receive directly at least the second coil group from said coil turn-forming means at an angularly displaced location in the coil group-receiving assembly from the first coil group for ultimate transfer from the coil group-receiving assembly into the electromagnetic device.
Claim 33
Dependent Claim
238 words
Apparatus for developing a plurality of coil groups formed of electrically conductive wire material for use in an electromagnetic device and for sequentially receiving a first coil group after development thereof prior to developing at least a second coil group, the apparatus comprising: coil turn-forming means; winding means for generating turns of wire about said coil turn-forming means to provide the plurality of coil groups; a coil group-receiving assembly having a number of sets of angularly spaced apart coil-receiving slots for temporarily accommodating a plurality of coil groups in angularly spaced relation for ultimate insertion into a magnetic core of the electromagnetic device; means for maintaining a preselected set of spaced apart coil-receiving slots of the coil group-receiving assembly and coil turn-forming means in adjacent aligned relation such that the preselected set of slots is in position to receive directly the first coil group from said coil turn-forming means prior to developing at least the second coil group and for sequentially indexing at least one other set of angularly spaced apart coil-receiving slots and the coil turn-forming means into the adjacent aligned relation so that said at least one other set of slots is thereafter in position to receive directly at least the second coil group from said coil turn-forming means at an angularly displaced location in the coil group-receiving assembly from the first coil group for ultimate transfer from the coil group-receiving assembly into the electromagnetic device.
Claim 34
Dependent Claim
59 words
The apparatus of claim 21 in which the coil turn-forming means includes a plurality of adjacent steps for defining coils of different sizes in each coil group; and said means for maintaining sequentially maintains coil-receiving slots of each set in the adjacent aligned relation with the different steps to receive the coils of different sizes for each coil group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |