Patent US3613423A successfully refreshed from Google Patents.
US3613423A
Expired / Lapsed
US
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Bulging apparatus
Assignee: Individual
•
Filing: 1970-01-02
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Granted: 1971-10-19
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Expires: 1990-01-02
Abstract
Abstract A FLUID PRESSURE BULGING APPARATUS COMPRISED OF A DIE CAVITY IN WHICH A TUBE TO BE BULGED IS ENCLOSED. A CHUCK AUTOMATICALLY GRIPS THE FRONT END OF THE TUBE TO PERMIT ACCURATE BULGING WITHOUT OFF-CENTER WORKING.
Inventors
- 👤 Masanobu Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/045
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |