US3910707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air pressure compensation arrangement for a cartridge and writing or drawing instrument
Assignee: JS Staedtler GmbH and Co KG
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Filing: 1974-07-18
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Granted: 1975-10-07
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Expires: 1994-07-18
Abstract
Abstract An arrangement for sealingly connecting a cartridge containing writing fluid to a writing or drawing instrument includes passageway means which are arranged to permit air to escape between the cartridge and the writing or drawing instrument as the cartridge is being inserted in place, thereby avoiding undesirable entrapment of air between the cartridge neck and the writing instrument which would otherwise tend to effect a pressure buildup and result in leakage of the writing fluid.
Inventors
- 👤 Claus Gottschalk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:34
CPC Classifications
B; B43; B43K; B43K5/00; B43K5/02; B43K5/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
An arrangement for connecting a cartridge containing a writing liquid with a writing head wherein the cartride has a neck insertablE within an annular slot in the writing head, the combination wherein said annular slot and said cartridge neck have inner and outer annular surfaces, at least a portion of said inner annular surface of said writing head being adapted to sealingly mate with a corresponding portion of the inner annular surface of said cartridge neck, at least a portion of said outer annular surface of said writing head being adapted to sealingly mate with a corresponding portion of the outer annular surface of said cartridge neck, said sealing mating being effected as said cartridge neck is being inserted within said annular slot in said writing head, longitudinally extending passageway means in at least two of said annular surfaces providing for egress of air from said annular slot as the cartridge neck is being inserted in said annular slot in said writing head, said passageway means having axial lengths shorter than the respective axial lengths of the inner and outer annular surfaces so that complete circumferential sealing is effected between said mating annular surfaces just before the cartridge neck reaches its seated position on the writing head.
Claim 2
Dependent Claim
207 words
An arrangement for connecting a cartridge containing a writing liquid with a writing head wherein the cartride has a neck insertablE within an annular slot in the writing head, the combination wherein said annular slot and said cartridge neck have inner and outer annular surfaces, at least a portion of said inner annular surface of said writing head being adapted to sealingly mate with a corresponding portion of the inner annular surface of said cartridge neck, at least a portion of said outer annular surface of said writing head being adapted to sealingly mate with a corresponding portion of the outer annular surface of said cartridge neck, said sealing mating being effected as said cartridge neck is being inserted within said annular slot in said writing head, longitudinally extending passageway means in at least two of said annular surfaces providing for egress of air from said annular slot as the cartridge neck is being inserted in said annular slot in said writing head, said passageway means having axial lengths shorter than the respective axial lengths of the inner and outer annular surfaces so that complete circumferential sealing is effected between said mating annular surfaces just before the cartridge neck reaches its seated position on the writing head.
Claim 3
Dependent Claim
33 words
An arrangement according to claim 1 wherein said cartridge neck has a terminating end, at least one of said passageway means being formed in said cartridge neck and extending from said terminating end.
Claim 4
Dependent Claim
45 words
An arrangement according to claim 1 wherein said writing head has a terminating end defining the longitudinal end of said annular slot, at least one of said passageway means being formed in the annular surface defining said annular slot and extending from said terminating end.
Claim 5
Dependent Claim
40 words
An arrangement according to claim 1 wherein said passageway means is formed by at least one chamfer on the outer annular surface of said cartridge neck and at least one chamfer on the inner annular surface of said annular slot.
Claim 6
Dependent Claim
40 words
An arrangement according to claim 1 wherein said passageway means is formed by at least one groove on the inner annular surface of said cartridge neck and at least one groove in the outer annular surface of said annular slot.
Claim 7
Dependent Claim
41 words
An arrangement according to claim 1 wherein said passageway means is formed by at least one chamfer on the inner annular surface of said annular slot and at least one groove formed in the outer annular surface of said annular slot.
Claim 8
Dependent Claim
41 words
An arrangement according to claim 1 wherein said passageway means is formed by at least one chamfer formed on the outer annular surface of said cartridge neck and at least one groove in the inner annular surface of said cartridge neck.
Claim 9
Dependent Claim
23 words
An arrangement according to claim 1 wherein the longitudinal length of said mating and sealing surfaces is about from 0.2 to 1 mm.
Claim 10
Dependent Claim
23 words
An arrangement according to claim 1 wherein said passageway means is formed by a chamfer on at least one of said annular surfaces.
Claim 11
Dependent Claim
23 words
An arrangement according to claim 1 wherein said passageway means is formed by a groove in at least one of said annular surfaces.
References Cited (Backward Citations)
US3606556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |