Patent US3640631A successfully refreshed from Google Patents.
US3640631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marking pen
Assignee: Individual
•
Filing: 1969-09-26
•
Granted: 1972-02-08
•
Expires: 1989-09-26
Abstract
Abstract A marking applicator comprising a container having a fluid reservoir therein and a marking nib extending out of the other end of the container for applying fluid or ink to a surface, said nib being disposed in a cylindrical holder having a central bore therein with at least two shoulders therein with one forming a valve seat, a valve plunger secured to said nib and disposed within said bore, said valve plunger having two sealing surfaces thereon with one adapted to seat against one of said shoulders and spring biasing means normally maintaining said valve plunger in a closed position seated upon said shoulder. A secondary reservoir disposed within said valve plunger and in communication with said nib and with an annular channel provided between said valve plunger and said central bore and a bypass passage disposed in said holder adjacent said central bore for supplying fluid to the exterior of said nib when said valve plunger is unseated.
Inventors
- 👤 Piro Sotir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:38
CPC Classifications
B; B43; B43K; B43K5/00; B43K5/18; B43K5/1818; B43K5/1827; B43K5/1836; B43K5/1845
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
A marking pen for writing with ink and the like on a surface, comprising a casing with a primary fluid reservoir in one end thereof and a nib holder in the other end thereof, said holder having a central bore extending therethrough, an absorbent nib disposed in said bore and extending out the end thereof, a movable valve plunger disposed in said bore and having at least two vertically spaced annular sealing elements thereon, said annular sealing elements defining therebetween an annular chamber around said plunger formed between the plunger peripheral surface and the adjacent surface of said bore for receiving fluid when the valve plunger is unseated, biasing means normally holding the valve plunger seated when the nib is not being used, and means defining a secondary fluid reservoir in communication with said annular chamber and located in said plunger in communication with the top end of said absorbent nib, the surface of the bore being formed with a longitudinal recess past the lower end of which the lower one of said sealing elements moves when the valve plunger is unseated, placing said annular chamber in communication with the side surface of said absorbent nib.
Claim 2
Dependent Claim
196 words
A marking pen for writing with ink and the like on a surface, comprising a casing with a primary fluid reservoir in one end thereof and a nib holder in the other end thereof, said holder having a central bore extending therethrough, an absorbent nib disposed in said bore and extending out the end thereof, a movable valve plunger disposed in said bore and having at least two vertically spaced annular sealing elements thereon, said annular sealing elements defining therebetween an annular chamber around said plunger formed between the plunger peripheral surface and the adjacent surface of said bore for receiving fluid when the valve plunger is unseated, biasing means normally holding the valve plunger seated when the nib is not being used, and means defining a secondary fluid reservoir in communication with said annular chamber and located in said plunger in communication with the top end of said absorbent nib, the surface of the bore being formed with a longitudinal recess past the lower end of which the lower one of said sealing elements moves when the valve plunger is unseated, placing said annular chamber in communication with the side surface of said absorbent nib.
Claim 3
Dependent Claim
29 words
The pen of claim 1 wherein said longitudinal recess extends from a point below the upper of said sealing elements to a point spaced above the other sealing element.
Claim 4
Dependent Claim
65 words
The pen of claim 2 wherein said valve plunger has a countersink with said nib secured therein, and said secondary reservoir is disposed above said countersink centrally of said plunger, and a stem is provided on the plunger and said biasing means is a spring mounted on said stem and an annular disc is secured to said holder to retain said spring on said stem.
Claim 5
Dependent Claim
62 words
The pen of claim 3 wherein said first sealing element is an annular rim adapted to seat on a tapered shoulder in said bore and said other sealing element is an annular rim on the lower end of said plunger adjacent said nib, and a drilled passage is provided in said plunger in communication with said secondary reservoir and said annular chamber.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |