US3628876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing implement
Assignee: Porex Technologies Corp
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Filing: 1968-06-21
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Granted: 1971-12-21
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Expires: 1988-06-21
Abstract
Abstract The writing implement has a fluid reservoir, a rodlike applicator for conducting fluid from the reservoir to a writing surface and means supporting the applicator against axial movement under normal writing pressure. The applicator comprises a substantially continuous matrix of a wear-resistant, resilient, synthetic polymer having therethroughout a plurality of randomly disposed interconnected voids providing tortuous passageways of a size sufficient to permit capillary movement of a writing fluid therethrough upon contact of the point with the writing surface, the matrix having sufficient flexibility to permit resilient deformation of the point in engagement with the writing surface under normal writing pressure and having sufficient stiffness to maintain the forward end thereof in substantial axial alignment with the rearward end under normal writing pressure applied angularly to the point.
Inventors
- 👤 Robert S Casey
- 👤 Lynn P Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:29
CPC Classifications
B; B43; B43K; B43K5/00; B43K5/18; B43K5/1818; B43K5/1827; B43K5/1836; B43K5/1845
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
In a writing implement, a reservoir for writing fluid, an apertured gripping section, valve means between said reservoir and the aperture of said gripping section axially movable between a rearward open position and a forward closed position, and spring means resiliently urging said valve means toward said closed position for interrupting the flow of writing fluid from said reservoir into said gripping section aperture, an improved rodlike applicator disposed in said gripping section aperture for fluid communication with the writing fluid in said reservoir and extending forwardly from said gripping section for engagement with a writing surface, said applicator comprising a substantially continuous nonfibrous matrix of a resilient synthetic polymer having therethroughout a plurality of interconnecting voids providing capillary passageways of a size sufficient to permit capillary movement of the writing fluid therethrough upon contact of the applicator with the writing surface, said tip having sufficient flexibility to permit resilient deformation of the end thereof in engagement with the writing surface under normal writing pressure and having sufficient stiffness to permit the transmission of axial force therethrough to effect opening of said valve means against the resistance of said spring means.
Claim 2
Dependent Claim
191 words
In a writing implement, a reservoir for writing fluid, an apertured gripping section, valve means between said reservoir and the aperture of said gripping section axially movable between a rearward open position and a forward closed position, and spring means resiliently urging said valve means toward said closed position for interrupting the flow of writing fluid from said reservoir into said gripping section aperture, an improved rodlike applicator disposed in said gripping section aperture for fluid communication with the writing fluid in said reservoir and extending forwardly from said gripping section for engagement with a writing surface, said applicator comprising a substantially continuous nonfibrous matrix of a resilient synthetic polymer having therethroughout a plurality of interconnecting voids providing capillary passageways of a size sufficient to permit capillary movement of the writing fluid therethrough upon contact of the applicator with the writing surface, said tip having sufficient flexibility to permit resilient deformation of the end thereof in engagement with the writing surface under normal writing pressure and having sufficient stiffness to permit the transmission of axial force therethrough to effect opening of said valve means against the resistance of said spring means.
Claim 3
Dependent Claim
182 words
In a writing implement a reservoir for writing fluid, an apertured section extending forwardly of said reservoir, an improved rodlike applicator having a rearward end disposed in said section aperture for fluid communication with the writing fluid in said reservoir, and a forward end extending substantially beyond said section and terminating in a point formed for engagement with a writing surface, and means in said section engaging said rearward end and supporting said applicator against axial movement upon the application of writing pressure on said point, said applicator comprising a substantially continuous nonfibrous matrix of a wear-resistant, resilient, synthetic polymer having therethroughout a plurality of randomly disposed interconnected voids providing tortuous passageways of a size sufficient to permit capillary movement of a writing fluid therethrough upon contact of the point with the writing surface, said matrix having sufficient flexibility to permit resilient deformation of the point in engagement with the writing surface under normal writing pressure and having sufficient stiffness to maintain said forward end in substantial axial alignment with said rearward end under normal writing pressure applied angularly to said point.
Claim 4
Dependent Claim
182 words
In a writing implement a reservoir for writing fluid, an apertured section extending forwardly of said reservoir, an improved rodlike applicator having a rearward end disposed in said section aperture for fluid communication with the writing fluid in said reservoir, and a forward end extending substantially beyond said section and terminating in a point formed for engagement with a writing surface, and means in said section engaging said rearward end and supporting said applicator against axial movement upon the application of writing pressure on said point, said applicator comprising a substantially continuous nonfibrous matrix of a wear-resistant, resilient, synthetic polymer having therethroughout a plurality of randomly disposed interconnected voids providing tortuous passageways of a size sufficient to permit capillary movement of a writing fluid therethrough upon contact of the point with the writing surface, said matrix having sufficient flexibility to permit resilient deformation of the point in engagement with the writing surface under normal writing pressure and having sufficient stiffness to maintain said forward end in substantial axial alignment with said rearward end under normal writing pressure applied angularly to said point.
Claim 5
Dependent Claim
16 words
The structure of claim 2 wherein said applicator is frictionally held in position within said section.
Claim 6
Dependent Claim
44 words
The structure of claim 2 wherein the size of the voids varies throughout the cross section of the applicator with the voids at the surface of said applicator being of smaller size and greater capillarity than the voids in the remainder of said applicator.
Claim 7
Dependent Claim
19 words
The structure of claim 2 wherein said synthetic polymer is selected from the group consisting of polyolefins and polyamides.
Claim 8
Dependent Claim
17 words
The structure of claim 2 wherein the void volume is between about 40 and about 70 percent.
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |