Patent US3108371A successfully refreshed from Google Patents.
US3108371A
Expired / Lapsed
US
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Method of making sheet metal fastener
Assignee: Bishop and Babcock Corp
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Filing: 1959-11-16
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Granted: 1963-10-29
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Expires: 1979-11-16
Abstract
No abstract record available.
Inventors
- 👤 Robert A Munse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:34
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/24; Y; Y10; Y10S; Y10S411/00; Y10S411/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD OF FORMING A SHEET METAL FASTENER WHICH CONSISTS IN PRESSING FROM ONE SIDE OF A PIECE OF SHEET METAL A FORM OF THE GENERAL SHAPE OF THE FINISHED FASTENER, PUNCHING AN APERTURE IN SAID FORM SO THAT THE WALL OF THE APERTURE PROVIDES WITH THE ADJACENT OUTER WALL OF THE FORM AN ANGLE OF THE ORDER OF 60*, AND THEN INVERTING THE FORM BY PRESSURE TO A SIMILAR POSITION ON THE OPPOSITE SIDE OF THE SHEET METAL PIECE, WHEREBY THE OUTER EDGE OF THE PUNCHED APERTURE BECOMES THE INNER EDGE OF THE HOLE UPON INVERSION AND SAID ANGLE REMAINS APPROXIMATELY THE SAME, THE WALL OF THE APERTURE INCLINING UPWARDLY AND OUTWARDLY FROM THE INNER EDGE THEREOF.
Claim 2
Independent Claim
118 words
THE METHOD OF FORMING A SHEET METAL FASTENER WHICH CONSISTS IN PRESSING FROM ONE SIDE OF A PIECE OF SHEET METAL A FORM OF THE GENERAL SHAPE OF THE FINISHED FASTENER, PUNCHING AN APERTURE IN SAID FORM SO THAT THE WALL OF THE APERTURE PROVIDES WITH THE ADJACENT OUTER WALL OF THE FORM AN ANGLE OF THE ORDER OF 60*, AND THEN INVERTING THE FORM BY PRESSURE TO A SIMILAR POSITION ON THE OPPOSITE SIDE OF THE SHEET METAL PIECE, WHEREBY THE OUTER EDGE OF THE PUNCHED APERTURE BECOMES THE INNER EDGE OF THE HOLE UPON INVERSION AND SAID ANGLE REMAINS APPROXIMATELY THE SAME, THE WALL OF THE APERTURE INCLINING UPWARDLY AND OUTWARDLY FROM THE INNER EDGE THEREOF.
References Cited (Backward Citations)
US1977861A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |