US3368436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for perforating sheet material
Assignee: Unipunch Products Inc
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Filing: 1964-10-30
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Granted: 1968-02-13
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Weisbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:50
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/26; B21D28/265; B21D28/02; B21D28/04; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/215; Y10T83/2155; Y10T83/2159; Y10T83/869; Y10T83/8748; Y10T83/8821; Y10T83/8867
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
IN A PUNCH AND DIE CUTTING ASSEMBLY, A SUPPORTING ARM MEMBER, A STRIPPER SLEEVE MEMBER MOUNTED AND GUIDED IN A BORE OF SAID ARM IN AXIAL ALIGNMENT WITH A DIE OF SAID ASSEMBLY, A PUNCH MEMBER MOUNTED AND GUIDED AXIALLY IN SAID SLEEVE, STRIPPER SPRING MEANS CARRIED ON SAID SLEEVE AND SURROUNDING SAID PUNCH AND AN ENLARGED KNOB MEANS MOUNTED ON THE TOP OF SAID PUNCH AND OVERLYING THE TOP OF SAID SPRING AND HAVING OUTER SIDEWALLS EXTENDING DOWN TOWARDS THE STRIPPER SLEEVE FOR AXIAL ADJUSTMENT OF SAID PUNCH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |