Patent US3671616A successfully refreshed from Google Patents.
US3671616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing ball-pens
Assignee: Individual
•
Filing: 1970-08-06
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Granted: 1972-06-20
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Expires: 1990-08-06
Abstract
Abstract Ball pen tips are made of a heat moldable synthetic resin by molding and a steel ball is inserted in an inwardly diverging ball-embracing recess of the molded tip then the outwardly opening ball-embracing tip portion is squeezed under pressure during heating at predetermined temperatures.
Inventors
- 👤 Tozaburo Nakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:52
CPC Classifications
B; B43; B43K; B43K1/00; B43K1/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A method of manufacturing synthetic resin ball point pen tips, as claimed in claim 1, in which said synthetic resin is an acetal resin.
Claim 2
Dependent Claim
24 words
A method of manufacturing synthetic resIn ball point pen tips, as claimed in claim 1, in which said synthetic resin is a nylon resin.
Claim 3
Dependent Claim
59 words
A method of manufacturing synthetic resin ball point pen tips, as claimed in claim 1, comprising the step of squeezing the surface of the undercut tapered ball-receiving recess inwardly into contact with the ball from a plane extending through the center of the ball and perpendicularly to the axis of said tip to the ink exit of said tip.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |