Patent US3218906A successfully refreshed from Google Patents.
US3218906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Captive screw and washer assembly
Assignee: Individual
•
Filing: 1962-06-18
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Granted: 1965-11-23
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Expires: 1982-06-18
Abstract
No abstract record available.
Inventors
- 👤 James N Dupree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:17
CPC Classifications
F; F16; F16B; F16B41/00; F16B41/002; F16B43/00; F16B2043/008; Y; Y10; Y10S; Y10S411/00; Y10S411/999; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876; Y10T29/49908; Y10T29/49915; Y10T29/4992
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A WASHER FOR USE WITH A SCREW HAVING A THREADED SHAFT AND AN ENLARGED HEAD TO FORM A CAPTIVE SCREW AND WASHER ASSEMBLY, SAID WASHER BEING FORMED OF RESILIENT MATERIAL WITH A SCREW SHAFT RECEIVING PASSAGE THERETHROUGH PERPENDICULAR TO A FIRST SURFACE THEREOF AND AN ANNULAR FLANGE PROJECTING GENERALLY AXIALLY FROM THE PERIPHERY OF THE OPPOSITE SURFACE THEREOF DEFINING A SCREW HEAD RECEIVING CUP, SAID WASHER HAVING AN ANNULAR BOSS PROJECTING AXIALLY FROM SAID FIRST SURFACE AT SAID SCREW SHAFT RECEIVING PASSAGE AND CARRYING A GENERALLY RADIALLY EXTENDING TAPERED LIP TERMINATING IN A CIRCULAR OPENING AND PROJECTING INTO AND PARTIALLY CLOSING SAID PASSAGE FOR ENGAGING THE THREAD OF THE SCREW POSITIONED THEREIN, SAID WASHER HAVING AN ANNULAR GROOVE FORMED IN SAID FIRST SURFACE RADIALLY OUTWARDLY FROM SAID BOSS AND AN ANNULAR RIB WITH A CONCAVE END PROJECTING AXIALLY FROM SAID GROOVE, THE VOLUME OF SAID PROJECTING RIB BEING SUBSTANTIALLY EQUAL TO THE VOLUME OF THE UNFILLED PORTION OF SAID GROOVE.
Claim 2
Dependent Claim
160 words
A WASHER FOR USE WITH A SCREW HAVING A THREADED SHAFT AND AN ENLARGED HEAD TO FORM A CAPTIVE SCREW AND WASHER ASSEMBLY, SAID WASHER BEING FORMED OF RESILIENT MATERIAL WITH A SCREW SHAFT RECEIVING PASSAGE THERETHROUGH PERPENDICULAR TO A FIRST SURFACE THEREOF AND AN ANNULAR FLANGE PROJECTING GENERALLY AXIALLY FROM THE PERIPHERY OF THE OPPOSITE SURFACE THEREOF DEFINING A SCREW HEAD RECEIVING CUP, SAID WASHER HAVING AN ANNULAR BOSS PROJECTING AXIALLY FROM SAID FIRST SURFACE AT SAID SCREW SHAFT RECEIVING PASSAGE AND CARRYING A GENERALLY RADIALLY EXTENDING TAPERED LIP TERMINATING IN A CIRCULAR OPENING AND PROJECTING INTO AND PARTIALLY CLOSING SAID PASSAGE FOR ENGAGING THE THREAD OF THE SCREW POSITIONED THEREIN, SAID WASHER HAVING AN ANNULAR GROOVE FORMED IN SAID FIRST SURFACE RADIALLY OUTWARDLY FROM SAID BOSS AND AN ANNULAR RIB WITH A CONCAVE END PROJECTING AXIALLY FROM SAID GROOVE, THE VOLUME OF SAID PROJECTING RIB BEING SUBSTANTIALLY EQUAL TO THE VOLUME OF THE UNFILLED PORTION OF SAID GROOVE.
References Cited (Backward Citations)
US3126935A
Cited
US2439516A
Cited
US2592130A
Cited
US2660493A
Cited
US2941105A
Cited
US2761484A
Cited
US2761347A
Cited
US2826231A
Cited
US2831520A
Cited
US2949325A
Cited
US2995057A
Cited
US3083796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |