US3533926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic method for enlarging the bore of a tubular workpiece
Assignee: Vyskumny Ustav Mechanizacie A Automazacie
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Filing: 1967-09-25
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Granted: 1970-10-13
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Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 Jan Zubak
- 👤 Ctibor Trebichavsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:39
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2764540A
Cited
US3223600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |