US3655842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vibrating core in concrete pipe making machine
Assignee: VIROPAC Inc
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Filing: 1969-10-17
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Granted: 1972-04-11
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Expires: 1989-10-17
Abstract
Abstract The invention comprises a novel method of vibrating a core in a concrete pipe making machine. In a preferred embodiment, a novel core is inserted and vibrated simultaneously with formation of the cementitious pipe. Vibration may continue for a short period after pipe formation in order to insure complete compaction of material and elimination of voids.
Inventors
- 👤 Ferdinand A Trautner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:29
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/14; B28B21/16
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |