US2741936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming holes in metal
Assignee: Individual
•
Filing: 1951-03-10
•
Granted: 1956-04-17
•
Expires: 1971-03-10
Abstract
No abstract record available.
Inventors
- 👤 Wohlfahrt Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:55
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/10; B23B; B23B41/00; B23B41/02; B23Q1/00; B23Q1/0009; B23Q1/0018; B23Q1/0027; B23Q1/0036; Y; Y10; Y10T; Y10T408/00; Y10T408/03; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/55; Y10T408/561; Y10T408/5621; Y10T408/5622
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US47572A
Cited
US92395A
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US1322399A
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US665158A
Cited
US1281420A
Cited
DE621684C
Cited
US2240795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |