Patent US3456548A successfully refreshed from Google Patents.
US3456548A
Expired / Lapsed
US
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Screw with hexagonal-collared slotted head
Assignee: Parker Hannifin Corp
•
Filing: 1967-11-22
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Granted: 1969-07-22
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Expires: 1987-11-22
Abstract
No abstract record available.
Inventors
- 👤 Eugene D Schmidt
- 👤 Erwin L Schaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:09
CPC Classifications
F; F16; F16B; F16B23/00; F16B23/0092; Y; Y10; Y10S; Y10S411/00; Y10S411/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |