Patent US3392447A successfully refreshed from Google Patents.
US3392447A
Expired / Lapsed
US
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Sheet material punching device
Assignee: MCGILL METAL PRODUCTS CO
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Filing: 1966-04-22
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Granted: 1968-07-16
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Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 James C Hendricks
- 👤 Spencer C Wernham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:28
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/32; B26F1/36; B26F2001/365
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |