Patent US3687561A successfully refreshed from Google Patents.
US3687561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing implement
Assignee: Individual
•
Filing: 1971-04-23
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Granted: 1972-08-29
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Expires: 1991-04-23
Abstract
Abstract A writing implement, such as a marking instrument, includes separably coupled coaxial upper reservoir and lower barrel sections. A writing nib extends along and projects beyond the ends of the lower barrel section and has an ink feed bore along its length and terminates in a tapered writing tip. A piercing tube extends upwardly from the barrel bottom section and engages the top part of the nib and a venting passage of lesser maximum dimensions than the ink feed bore extends along the inner feed of the piercing tube and communicates with the exterior of the barrel bottom section. A replaceable liquid ink cartridge is housed in the reservoir section and is engaged by the piercing tube.
Inventors
- 👤 Phillip Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:02
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/14; B43K5/00; B43K5/02; B43K5/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
A writing implement comprising an elongated barrel including an upper hollow reservoir section and a coaxial lower section separably joined to the lower part of said upper section and having coaxial aligned bases proximate its upper and lower ends, a piercing tube projecting upwardly from said lower barrel section and coaxial with the bores of said sections, an elongated writing nib engaging said bores and having a tapered writing tip projecting below said barrel bottom section and a capillary bore extending along the length thereof, the inside face of said piercing tube and said upper bore and the confronting face of said nib delineating a venting passage of lesser maximum width than said capillary bore and said barrel lower section having an opening formed therein communicating with said venting passage and an ink cartridge replaceably housed in the reservoir section in said barrel upper section and having an end part engaged with said piercing tube.
Claim 2
Dependent Claim
155 words
A writing implement comprising an elongated barrel including an upper hollow reservoir section and a coaxial lower section separably joined to the lower part of said upper section and having coaxial aligned bases proximate its upper and lower ends, a piercing tube projecting upwardly from said lower barrel section and coaxial with the bores of said sections, an elongated writing nib engaging said bores and having a tapered writing tip projecting below said barrel bottom section and a capillary bore extending along the length thereof, the inside face of said piercing tube and said upper bore and the confronting face of said nib delineating a venting passage of lesser maximum width than said capillary bore and said barrel lower section having an opening formed therein communicating with said venting passage and an ink cartridge replaceably housed in the reservoir section in said barrel upper section and having an end part engaged with said piercing tube.
Claim 3
Dependent Claim
35 words
A writing implement of claim 1, wherein said piercing tube is part of a collar positioned within the upper part of said lower barrel section and extends beyond the end of said lower barrel section.
Claim 4
Dependent Claim
35 words
A writing implement as in claim 2, wherein said collar is tightly positioned within the bore of said lower section so that said piercing tube extends beyond the upper end of said lower barrel section.
Claim 5
Dependent Claim
25 words
A writing implement as in claim 3, wherein said nib end opposite to the writing tip of said nib is positioned within said piercing tube.
Claim 6
Dependent Claim
22 words
A writing implement as in claim 4, wherein said collar has a bore and said writing nib is received within said bore.
Claim 7
Dependent Claim
37 words
A writing instrument as in claim 5, wherein the writing tip of the nib extends beyond the lower end of said lower bottom barrel section and opposite end of said nib is received within said piercing tube.
Claim 8
Dependent Claim
14 words
A writing implement as in claim 1, wherein said nib is made of plastic.
Claim 9
Dependent Claim
35 words
A writing nib as in claim 1, wherein said capillary bore of said nib is within range of 0.046 inches and said venting passage has a cross sectional area of about 0.020 to 0.030 inches.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |