Patent US3611768A successfully refreshed from Google Patents.
US3611768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulging apparatus of metallic pipes
Assignee: OTSUYA TEKKO KK
•
Filing: 1969-06-30
•
Granted: 1971-10-12
•
Expires: 1989-06-30
Abstract
Abstract AN APPARATUS AND METHOD OF USING SAME FOR TRANSFORMING A TUBULAR BLANK INTO A SHORTENED TUBULAR MEMBER HAVING A CIRCUMFERENTIALLY EXTENDING SECTION OF A DESIRED CONFIGURATION AND EXPANDED DIAMETER. THE SECTION OF EXPANDED DIAMETER HAS SUBSTANTIALLY THE SAME WALL THICKNESS AS THE BALANCE OF THE TUBULAR MEMBER AFTER THE FORMING OPERATION IS COMPLETED.
Inventors
- 👤 Eijiro Odagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:18
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/043; B21D15/00; B21D15/04; B21D15/06; B21D26/047
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |