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US2738575A
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Apparatus for and method of dimpling work sheets
Assignee: Zephyr Manufacturing Co Inc
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Filing: 1952-11-10
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Granted: 1956-03-20
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Expires: 1972-11-10
Abstract
No abstract record available.
Inventors
- 👤 Charles J Swain
- 👤 Jr Roy V Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:02
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
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) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |