US3574080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting fastener means
Assignee: McDonnell Douglas Corp
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Filing: 1966-11-18
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Granted: 1971-04-06
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Expires: 1986-11-18
Abstract
Abstract A FASTENER FOR SECURING TWO SHEETS OF METAL TOGETHER INCLUDES A SHANK WHICH EXTENDS THROUGH THE SHEETS AND A HEAD POSITIONED AT THE OUTERMOST SHEET. THE HEAD IS PROVIDED WITH A RECESS INTO WHICH A RING IS FITTED, AND THE RING BEARS AGAINST THE OUTERMOST SHEET ADJACENT TO THE OUTER SURFACE THEREOF. THE RING IS FORMED FROM A METAL HIGHER IN THE ELECTROMOTIVE SERIES OF METALS THAN BOTH THE METAL OF THE HEAD OR THE OUTERMOST SHEET. D R A W I N G
Inventors
- 👤 Joseph E Jones
- 👤 David S Macy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:50
CPC Classifications
F; F16; F16B; F16B33/00; F16B33/008; F16B35/00; F16B35/04; F16B35/06; Y; Y10; Y10S; Y10S411/00; Y10S411/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |