US4287146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nib-type writing pen and method of manufacture
Assignee: Individual
•
Filing: 1978-10-06
•
Granted: 1981-09-01
•
Expires: 1998-10-06
Abstract
Abstract A nib-type writing pen is formed by compressing a plurality of fibers into a bundle, extruding a plastic sheath around the fiber bundle, cutting the sheathed fiber bundle to a suitable length and injecting a urethane prepolymer into one or both ends of the cut and sheathed fiber bundle.
Inventors
- 👤 Yoshio Midorikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:17
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/02; B43K8/022; B43K1/00; B43K1/12; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A method of manufacturing a writing pen having a completely integral writing nib portion and ink reservoir, comprising the steps of: passing fibers through a die to compress and form them into a fiber bundle; extruding a plastic sheath around said fiber bundle; cutting the sheathed fiber bundle thus formed into a predetermined length; injecting urethane prepolymer liquid under pressure into either or both ends of the cut and sheathed fiber bundle to impregnate same; allowing the urethane polymer to harden; and machining the impregnated end portions to a suitable shape.
Claim 2
Independent Claim
91 words
A method of manufacturing a writing pen having a completely integral writing nib portion and ink reservoir, comprising the steps of: passing fibers through a die to compress and form them into a fiber bundle; extruding a plastic sheath around said fiber bundle; cutting the sheathed fiber bundle thus formed into a predetermined length; injecting urethane prepolymer liquid under pressure into either or both ends of the cut and sheathed fiber bundle to impregnate same; allowing the urethane polymer to harden; and machining the impregnated end portions to a suitable shape.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said elongated air passage is formed by forming a groove in the inner surface of said sheath during extrusion of the sheath.
Claim 4
Dependent Claim
42 words
The method of claim 2, wherein said step of forming said groove shapes said groove so that the width of said groove is small at the surface of said sheath and expands to a wider width in the interior of said groove.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said elongated air passage is formed by forming a groove in the periphery of the fiber bundle during passage through the die.
Claim 6
Dependent Claim
25 words
The method of claim 1 in which the cut and sheathed bundle is centered in a tapered injection nozzle for injection of the urethane prepolymer.
Claim 7
Dependent Claim
29 words
The method of claim 1 comprising the further step of forming an elongated air passage extending lengthwise along the surface of said bundle between said sheath and said bundle.
References Cited (Backward Citations)
US3178770A
Cited
US3342162A
Cited
US3374767A
Cited
US3442002A
Cited
US3733246A
Cited
US3714314A
Cited
US3767520A
Cited
US3864183A
Cited
US4086312A
Cited
US4104781A
Cited
US4119756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |