US3824023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venting device for stylographic pens
Assignee: Koh-I-Noor Rapidograph Inc
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Filing: 1973-06-21
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Granted: 1974-07-16
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Expires: 1993-06-21
Abstract
Abstract A vent system for a tube writing pen wherein the vent consists of a longitudinally adjustable threaded stem extending within the writing fluid reservoir and venting at varying depths within the writing fluid. The upper end of the stem is open to atmospheric pressure through a venting channel defined in the pen housing.
Inventors
- 👤 F Micale
- 👤 R Wagner
- 👤 W Danjczek
- 👤 J Leuenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:17
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/16; B43K8/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A stylographic ink writing pen comprising: A. a housing having a venting channel extending from the exterior to the interior thereof; B. a writing nib; C. a tubular writing tip having its lower end extending through the bottom of said nib; D. an ink reservoir supported within said nib and communicant with said writing tip; E. a threaded venting stem including a venting aperture and reciprocably positioned within said housing and between said venting channel and the interior of said reservoir, said stem being vertically adjustible within said housing, so as to vary the height of said venting aperture interior and with respect to said writing tip; F. a weight and cleaning wire assembly supported within said threaded venting stem, such that said cleaning wire extends reciprocably into said tubular writing tip.
Claim 2
Dependent Claim
132 words
A stylographic ink writing pen comprising: A. a housing having a venting channel extending from the exterior to the interior thereof; B. a writing nib; C. a tubular writing tip having its lower end extending through the bottom of said nib; D. an ink reservoir supported within said nib and communicant with said writing tip; E. a threaded venting stem including a venting aperture and reciprocably positioned within said housing and between said venting channel and the interior of said reservoir, said stem being vertically adjustible within said housing, so as to vary the height of said venting aperture interior and with respect to said writing tip; F. a weight and cleaning wire assembly supported within said threaded venting stem, such that said cleaning wire extends reciprocably into said tubular writing tip.
Claim 3
Dependent Claim
40 words
A stylographic writing pen as in claim 1, said venting stem including an helical exterior venting channel extending from the top to the bottom thereof and a radially inwardly extending venting aperture extending interiorly from the bottom of said helix.
Claim 4
Dependent Claim
18 words
A stylographic writing pen as in claim 2, said housing venting channel communicating with said venting stem helix.
Claim 5
Dependent Claim
85 words
A stylographic writing pen as in claim 3, said venting stem, said writing nib and tubular writing tip being vertically adjustable with respect to said venting channel in said housing. F lg X - 2 gamma /rA Where: F magnitude of the hydrostatic head l density of the writing fluid g acceleration due to gravity 980 cm/sec.2 rA radius of vent stem bottom tip X distance between vent stem bottom tip and the lower end of the writing point. gamma surface tension of writing fluid.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |