Patent US387447A successfully refreshed from Google Patents.
Patent US4369701A successfully refreshed from Google Patents.
US4369701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calligraphic apparatus and method
Assignee: Individual
•
Filing: 1981-03-04
•
Granted: 1983-01-25
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Expires: 2001-03-04
Abstract
Abstract Disclosed herein are an attachment, method, and apparatus for producing calligraphic lettering. The attachment, method, and apparatus involve supporting a calligraphic lettering implement such that the lettering implement does not rotate relative to a workpiece to be lettered as the lettering implement is moved over the workpiece to form a desired letter, character, or symbol thereon. There is also disclosed an engraving tool which has a chisel-pointed, carbide steel tip.
Inventors
- 👤 William A. Richardson
- 👤 Douglas A. Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:34
CPC Classifications
B; B44; B44B; B44B3/00; B44B3/001; B44B3/002; B43; B43L; B43L13/00; B43L13/10
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
162 words
A method of producing calligraphic lettering employing apparatus including holding means for holding a workpiece to be lettered, lettering means for lettering a workpiece held by said holding means, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, following means for following single-line indicia fixedly positioned by said positioning means, connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, said method comprising the step of attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 2
Independent Claim
162 words
A method of producing calligraphic lettering employing apparatus including holding means for holding a workpiece to be lettered, lettering means for lettering a workpiece held by said holding means, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, following means for following single-line indicia fixedly positioned by said positioning means, connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, said method comprising the step of attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 3
Independent Claim
184 words
A method of retrofitting engraving apparatus which normally include holding means for holding a workpiece to be engraved, engraving means for engraving a workpiece held by said holding means, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, following means for following indicia fixedly positioned by said positioning means, connecting means for connecting said engraving means to said following means such that the movement of said engraving means copies the movement of said following means, said method comprising the step of replacing said engraving means with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 4
Independent Claim
184 words
A method of retrofitting engraving apparatus which normally include holding means for holding a workpiece to be engraved, engraving means for engraving a workpiece held by said holding means, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, following means for following indicia fixedly positioned by said positioning means, connecting means for connecting said engraving means to said following means such that the movement of said engraving means copies the movement of said following means, said method comprising the step of replacing said engraving means with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 5
Dependent Claim
155 words
Calligraphic apparatus, comprising holding means for holding a workpiece to be lettered, lettering means for calligraphically lettering a workpiece held by said holding means, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, following means for following single-line indicia fixedly positioned by said positioning means, connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, and attaching means for attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 6
Dependent Claim
155 words
Calligraphic apparatus, comprising holding means for holding a workpiece to be lettered, lettering means for calligraphically lettering a workpiece held by said holding means, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, following means for following single-line indicia fixedly positioned by said positioning means, connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, and attaching means for attaching said lettering means to said connecting means such that said lettering means continuously and automatically rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 7
Dependent Claim
23 words
Apparatus according to claim 3, wherein said connecting means includes a pantographic mechanism and a spindle holder fixedly attached to said pantographic mechanism.
Claim 8
Dependent Claim
189 words
Apparatus according to claim 4, wherein said attaching means includes a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle; mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means; a collar fixedly attached to said second end of said spindle; a support rod pivotally attached to said collar; a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction; and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 9
Dependent Claim
14 words
Apparatus according to claim 5, wherein said lettering means is a chisel-pointed lettering implement.
Claim 10
Dependent Claim
12 words
Apparatus according to claim 6, wherein said lettering implement is a pen.
Claim 11
Dependent Claim
13 words
Apparatus according to claim 6, wherein said lettering implement is an engraving tool.
Claim 12
Dependent Claim
42 words
Apparatus according to claim 6, wherein said attaching means includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
Claim 13
Dependent Claim
162 words
An attachment for engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, a pantographic mechanism, and following means attached to said pantographic mechanism for following single-line indicia fixedly positioned by said positioning means, said attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means continuously and automatically rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 14
Dependent Claim
162 words
An attachment for engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, a pantographic mechanism, and following means attached to said pantographic mechanism for following single-line indicia fixedly positioned by said positioning means, said attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means continuously and automatically rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 15
Dependent Claim
14 words
An attachment according to claim 10, wherein said pantographic mechanism includes a spindle holder.
Claim 16
Dependent Claim
190 words
An attachment according to claim 11, wherein said attaching means includes a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle; mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means; a collar fixedly attached to said second end of said spindle; a support rod pivotally attached to said collar; a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction; and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 17
Dependent Claim
15 words
An attachment according to claim 12, wherein said lettering means is a chisel-pointed lettering implement.
Claim 18
Dependent Claim
13 words
An attachment according to claim 13, wherein said lettering implement is a pen.
Claim 19
Dependent Claim
14 words
An attachment according to claim 13, wherein said lettering implement is an engraving tool.
Claim 20
Dependent Claim
43 words
An attachment according to claim 13, wherein said attaching means includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
Claim 21
Dependent Claim
166 words
In engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, a pantographic mechanism, and following means attached to said pantographic mechanism for following indicia fixedly positioned by said positioning means, the improvement wherein said apparatus is retrofitted with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means continuously and automatically rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 22
Dependent Claim
166 words
In engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, a pantographic mechanism, and following means attached to said pantographic mechanism for following indicia fixedly positioned by said positioning means, the improvement wherein said apparatus is retrofitted with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means continuously and automatically rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means.
Claim 23
Dependent Claim
14 words
Improved apparatus according to claim 17, wherein said pantographic mechanism includes a spindle holder.
Claim 24
Dependent Claim
190 words
Improved apparatus according to claim 16, wherein said attaching means includes a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle; mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means; a collar fixedly attached to said second end of said spindle; a support rod pivotally attached to said collar; a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction; and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 25
Dependent Claim
15 words
Improved apparatus according to claim 19, wherein said lettering means is a chisel-pointed lettering implement.
Claim 26
Dependent Claim
13 words
Improved apparatus according to claim 20, wherein said lettering implement is a pen.
Claim 27
Dependent Claim
14 words
Improved apparatus according to claim 20, wherein said lettering implement is an engraving tool.
Claim 28
Dependent Claim
43 words
Improved apparatus according to claim 20, wherein said attaching means includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
Claim 29
Dependent Claim
345 words
Calligraphic apparatus, comprising holding means for holding a workpiece to be lettered; lettering means for calligraphically lettering a workpiece held by said holding means; positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means; following means for following single-line indicia fixedly positioned by said positioning means; connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, said connecting means including a pantographic mechanism and a spindle holder fixedly attached to said pantographic mechanism; and attaching means for attaching said lettering means to said connecting means such that said lettering means rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 30
Dependent Claim
345 words
Calligraphic apparatus, comprising holding means for holding a workpiece to be lettered; lettering means for calligraphically lettering a workpiece held by said holding means; positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means; following means for following single-line indicia fixedly positioned by said positioning means; connecting means for connecting said lettering means to said following means such that the movement of said lettering means copies the movement of said following means, said connecting means including a pantographic mechanism and a spindle holder fixedly attached to said pantographic mechanism; and attaching means for attaching said lettering means to said connecting means such that said lettering means rotates relative to said connecting means without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 31
Dependent Claim
14 words
Apparatus according to claim 24, wherein said lettering means is a chisel-pointed lettering implement.
Claim 32
Dependent Claim
12 words
Apparatus according to claim 25, wherein said lettering implement is a pen.
Claim 33
Dependent Claim
13 words
Apparatus according to claim 25, wherein said lettering implement is an engraving tool.
Claim 34
Dependent Claim
43 words
Apparatus according to claim 25, wherein said attaching means further includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
Claim 35
Dependent Claim
351 words
An attachment for engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, a pantographic mechanism, a spindle holder attached to said pantographic mechanism, and following means attached to said pantographic mechanism for following single-line indicia fixedly positioned by said positioning means, said attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and a first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism to said second direction.
Claim 36
Dependent Claim
351 words
An attachment for engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning single-line indicia relative to a workpiece held by said holding means, a pantographic mechanism, a spindle holder attached to said pantographic mechanism, and following means attached to said pantographic mechanism for following single-line indicia fixedly positioned by said positioning means, said attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and a first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism to said second direction.
Claim 37
Dependent Claim
15 words
An attachment according to claim 29, wherein said lettering means is a chisel-pointed lettering implement.
Claim 38
Dependent Claim
13 words
An attachment according to claim 30, wherein said lettering implement is a pen.
Claim 39
Dependent Claim
14 words
An attachment according to claim 30, wherein said lettering implement is an engraving tool.
Claim 40
Dependent Claim
43 words
An attachment according to claim 30, wherein said attaching means includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
Claim 41
Dependent Claim
354 words
In engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, a pantographic mechanism, a spindle holder attached to said pantographic mechanism, and following means attached to said pantographic mechanism for following indicia fixedly positioned by said positioning means, the improvement wherein said apparatus is retrofitted with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 42
Dependent Claim
354 words
In engraving apparatus which normally include holding means for holding a workpiece to be lettered, positioning means for fixedly positioning indicia relative to a workpiece held by said holding means, a pantographic mechanism, a spindle holder attached to said pantographic mechanism, and following means attached to said pantographic mechanism for following indicia fixedly positioned by said positioning means, the improvement wherein said apparatus is retrofitted with an attachment including lettering means for calligraphically lettering a workpiece held by said holding means and attaching means for attaching said lettering means to said pantographic mechanism such that the movement of said lettering means copies the movement of said following means and such that said lettering means rotates relative to said pantographic mechanism without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, whereby single-line indicia fixedly positioned by said positioning means may be used to produce calligraphic lettering on a workpiece held by said holding means, said attaching means including a spindle, having a first end, a second end and first receiving means formed in said first end for fixedly receiving said lettering means such that said lettering means does not rotate relative to said spindle, mounting means for mounting said spindle in said spindle holder such that said spindle rotates relative to said spindle holder without rotating relative to a workpiece held by said holding means during the movement of said lettering means as it copies the movement of said following means, a collar fixedly attached to said second end of said spindle, a support rod pivotally attached to said collar, a carriage, including second receiving means for slideably receiving said support rod such that said support rod is movable in a first direction relative to said carriage in response to the movement of said pantographic mechanism in said first direction, and supporting means for slideably supporting said carriage such that said carriage is movable in a second direction, generally perpendicular to said first direction, in response to the movement of said pantographic mechanism in said second direction.
Claim 43
Dependent Claim
15 words
Improved apparatus according to claim 34, wherein said lettering means is a chisel-pointed lettering implement.
Claim 44
Dependent Claim
13 words
Improved apparatus according to claim 35, wherein said lettering implement is a pen.
Claim 45
Dependent Claim
14 words
Improved apparatus according to claim 35, wherein said lettering implement is an engraving tool.
Claim 46
Dependent Claim
43 words
Improved apparatus according to claim 35, wherein said attaching means includes adjusting means for adjusting the angular position of said lettering implement relative to a workpiece held by said holding means, whereby said lettering implement may produce several different styles of calligraphic lettering.
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |