US4407428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cap for a paper core
Assignee: Individual
•
Filing: 1981-03-06
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Granted: 1983-10-04
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Expires: 2001-03-06
Abstract
Abstract Apparatus and process for cold drawing a disk into a cap for a paper core. The process comprises cold drawing a disk to form a cylindrical cup having a rim and a socket, removing the central portion of the cup leaving a flange, straightening the flange and trimming the rim. The resultant cap is characterized by having a uniform-sized rim of a width equal to the width of the socket. The apparatus comprises a press having a fixed portion and a movable portion, a cylindrical member mounted on the fixed portion, a ram and a number of opposed cylinders carried by the movable portion, and means for moving the movable portion toward the fixed portion.
Inventors
- 👤 Harris E. Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
B; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/185; B65H75/187; B21; B21D; B21D51/00; B21D51/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
81 words
A strengthened cap for a paper core comprising: (a) a cylindrical tube, having an upper portion and a lower portion, said lower portion terminating in a slight bead to facilitate the insertion thereof into said paper core; (b) a socket protruding radially from said upper portion of said tube; and (c) a circular uniform-sized rim of constant inside and outside diameter formed outwardly and at the top of said tube, said uniform-sized rim giving added structural strength to said protruding socket.
Claim 2
Dependent Claim
81 words
A strengthened cap for a paper core comprising: (a) a cylindrical tube, having an upper portion and a lower portion, said lower portion terminating in a slight bead to facilitate the insertion thereof into said paper core; (b) a socket protruding radially from said upper portion of said tube; and (c) a circular uniform-sized rim of constant inside and outside diameter formed outwardly and at the top of said tube, said uniform-sized rim giving added structural strength to said protruding socket.
Claim 3
Dependent Claim
34 words
The strengthened cap of claim 1 wherein said rim is of a width equal to the width of said socket, providing said cap with extra crush strength and a more evenly distributed crush strength.
References Cited (Backward Citations)
US1432252A
Cited
US3611552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |