Patent US3620115A successfully refreshed from Google Patents.
US3620115A
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US
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Apparatus for making perforations in corrugated tubes
Assignee: Frankische Isolierrohr und Metallwaren Werke Gebr Kirchner
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Filing: 1968-12-31
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Granted: 1971-11-16
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Expires: 1988-12-31
Abstract
Abstract APPARATUS FOR MAKING PERFORATIONS IN HELICALLY OR CIRCUMFERENTIALLY CORRUGATED PLASTIC TUBES COMPRISES FLAT PLATE-LIKE PERFORATING TOOLS WHICH ARE MOVABLE RADIALLY TOWARD AND AWAY FROM THE TUBE, A FEEDING MECHANISM WHICH ADVANCES THE TUBE, EITHER STEPWISE OR CONTINUOUSLY, AND DRIVEN CARRIERS WHICH SUPPORT THE TOOLS AND ARE MOVABLE RADIALLY OF THE TUBE OR IN PLANES WHICH INCLUDE THE AXIS OF THE TUBE. EACH TOOL HAS A CUTTING EDGE WHICH IS FLANKED BY RECEDING SURFACES AT BOTH SIDES AND IS PROVIDED WITH PRONOUNCED TEETH HAVING TIPS LOCATED AT THE SAME LEVEL OR AT DIFFERENT LEVELS.
Inventors
- 👤 Wilhelm Zieg
- 👤 Georg Schmidt
- 👤 Edgar Hauck
- 👤 Ingo Massell
- 👤 Gustav Gruebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:00
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/36; B21D28/28; B26; B26F; B26F1/00; B26F1/0015; B26F1/0061; B26F1/0069; B26F1/0076; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0596; Y10T83/384; Y10T83/39; Y10T83/395; Y10T83/40; Y10T83/401; Y10T83/444; Y10T83/4501; Y10T83/4503; Y10T83/4622; Y10T83/463; Y10T83/4635; Y10T83/727; Y10T83/739; Y10T83/929; Y10T83/9314; Y10T83/9411; Y10T83/9423; Y10T83/9428; Y10T83/9435
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |