Patent US3932044A successfully refreshed from Google Patents.
US3932044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pen point for writing instruments
Assignee: Aubex Corp
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Filing: 1974-11-29
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Granted: 1976-01-13
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Expires: 1994-11-29
Abstract
Abstract Pen point for writing instrument comprising a cylindrical article composed of united thermoplastic synthetic resin monofilaments, said cylindrical article being provided with an even number of more than 4 of radial curved narrow slots having capillary action and extending toward the center of the cylindrical article from the inside of the outer periphery, which are confined by triangular projected segments, top of which segment is circular and side walls of said radial curved narrow slot being formed by a plurality of semicircles, which are arranged so that the semicircles in the opposite side walls are engaged with each other under writing pressure.
Inventors
- 👤 Nobuyuki Otake
- 👤 Yukinori Sato
- 👤 Kozo Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:40
CPC Classifications
B; B43; B43K; B43K1/00; B43K1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
Pen point for writing instruments comprising a cylindrical article formed by uniting together a large number of molten thermoplastic synthetic resin monofilaments, said cylindrical article having a conical portion at least at one end, which is provided with radial curved narrow slots extending toward the center of the cylindrical article from the inside of the outer periphery of the article in the transverse section, said radial curved narrow slots being defined by an even number of at least 4 of triangular projected segments, each top portion of said triangular projected segments being circular, said triangular projected segments having two different heights, the segment having a larger height and the segment having a smaller height being arranged in an adjacent relation, said segments having the larger height being converged in the center portion to form a space bore and side walls of each radial slot being formed by a plurality of semicircles and said semicircles in opposite side walls being arranged so as to engage with each other under writing pressure, and further said radial curved narrow slots and the center space bore being axially extended from one end of the cylindrical article to the other end.
Claim 2
Dependent Claim
196 words
Pen point for writing instruments comprising a cylindrical article formed by uniting together a large number of molten thermoplastic synthetic resin monofilaments, said cylindrical article having a conical portion at least at one end, which is provided with radial curved narrow slots extending toward the center of the cylindrical article from the inside of the outer periphery of the article in the transverse section, said radial curved narrow slots being defined by an even number of at least 4 of triangular projected segments, each top portion of said triangular projected segments being circular, said triangular projected segments having two different heights, the segment having a larger height and the segment having a smaller height being arranged in an adjacent relation, said segments having the larger height being converged in the center portion to form a space bore and side walls of each radial slot being formed by a plurality of semicircles and said semicircles in opposite side walls being arranged so as to engage with each other under writing pressure, and further said radial curved narrow slots and the center space bore being axially extended from one end of the cylindrical article to the other end.
Claim 3
Dependent Claim
16 words
The pen point as claimed in claim 1, wherein six radial curved narrow slots are provided.
Claim 4
Dependent Claim
21 words
The pen point as claimed in claim 1, wherein said pen point is composed of polyacetal, polyphenylene oxide, nylon or polyolefin.
Claim 5
Dependent Claim
24 words
The pen point as claimed in claim 1, wherein each of said triangular projected segments is provided with a center bore for conveying ink.
Claim 6
Dependent Claim
21 words
The pen point as claimed in claim 1, wherein said cylindrical article is covered with a thermoplastic synthetic resin circular coating.
Claim 7
Dependent Claim
27 words
The pen point as claimed in claim 1, wherein said cylindrical article is covered with a thermoplastic synthetic resin coating provided with a plurality of air passageways.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |