Patent US3611552A successfully refreshed from Google Patents.
US3611552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold drawing a disk into a cap for paper core
Assignee: Individual
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Filing: 1970-03-09
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Granted: 1971-10-12
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Expires: 1990-03-09
Abstract
Abstract A METAL COP FOR A PAPER CORE IS MADE BY THREE OPERATIONS: (1) DEPRESSING THE CENTRAL AREA OF A STEEL DISK TO FORM A SHALLOW CUP, (2) DEEPENING THE CUP AND SIMULTANEOUSLY FORMING A SOCKET IN THE WALL OF THE CUP, (3) CUTTING OUT THE CENTRAL PORTION OF THE BOTTOM OF THE CUP TO LEAVE AN INWARD BOTTOM FLANGE AND STRAIGHTENING THE FLANGE TO ADD TO THE LENGTH OF THE CYLINDRICAL WALL OF THE OBJECT. A SLIGHT RADIUS IS MAINTAINED AROUND THE END TO PERMIT INSERTION IN A CORE WHERE IT IS SUBSEQUENTLY EXPANDED.
Inventors
- 👤 Philip S Cushing
- 👤 Harris E Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:58
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/04; B21D51/00; B21D51/16; B31; B31F; B31F1/00; B31F1/008; B31F1/0093; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/185; B65H75/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49922; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |