US3354481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw slot
Assignee: Shared Technologies Fairchild Telecom Inc
•
Filing: 1965-12-22
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Granted: 1967-11-28
•
Expires: 1985-12-22
Abstract
No abstract record available.
Inventors
- 👤 Emric W Bergere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:36
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/44; B21K1/46; B21K1/463
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF FORMING A SCREW HEAD WHICH CONSISTS IN SUPPORTING A BLANK IN A DIE, STRIKING THE HEAD PORTION WITH A COMBINED HEADING AND SLOT FORMING PUNCH CONTAINING CAVITIES TO PROVIDE RAISED PROTRUSIONS ALONG THE PERIPHERAL PORTIONS OF THE DIVERGING SLOT FACES AND BY STRIKING THE RAISED PORTIONS TO CAUSE THE SIDE WALLS OF THE SLOT TO CONVERGE INWARDLY AT THE OUTER EDGES, RETAINING A VERTICAL WALL AT THE CENTRAL PORTION OF THE SLOT.
Claim 2
Independent Claim
75 words
THE METHOD OF FORMING A SCREW HEAD WHICH CONSISTS IN SUPPORTING A BLANK IN A DIE, STRIKING THE HEAD PORTION WITH A COMBINED HEADING AND SLOT FORMING PUNCH CONTAINING CAVITIES TO PROVIDE RAISED PROTRUSIONS ALONG THE PERIPHERAL PORTIONS OF THE DIVERGING SLOT FACES AND BY STRIKING THE RAISED PORTIONS TO CAUSE THE SIDE WALLS OF THE SLOT TO CONVERGE INWARDLY AT THE OUTER EDGES, RETAINING A VERTICAL WALL AT THE CENTRAL PORTION OF THE SLOT.
References Cited (Backward Citations)
US2182092A
Cited
US2304704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |