US3877341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-lightweight metallic threaded fasteners
Assignee: Harvard Industries Inc
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Filing: 1973-02-26
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Granted: 1975-04-15
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Expires: 1993-02-26
Abstract
Abstract Ultra-lightweight metallic threaded fasteners having a thinwalled tubular body including threaded body portions in which the wall thickness is no greater than the depth of the thread, and effectively unthreaded body portions extending axially along the body for reinforcing the tubular body against axial loading.
Inventors
- 👤 David W Grimm
- 👤 Executrix By Betty Ann Grimm
- 👤 Michael F Mihaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; F16B37/041; F16B37/043; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/97
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
An ultra-lightweight metallic threaded fastener comprising: a thin-walled tubular body including a radially extending flange at one end of the tubular body; threaded body portions in which the wall thickness is no greater than the depth of the thread therein; effectively unthreaded body portions unitary with the threaded body portions and extending axially along the body for reinforcing the tubular body against axial loading, the unthreaded body portions including at least two reinforcing ribs projecting radially outwardly beyond the radial extent of the threaded body portions and extending axially between the flange and the opposite end of the tubular body; the radial extent of each rib being greatest at a location spaced axially from the flange toward said opposite end and decreasing between said location and the flange to provide an indentation adjacent the flange; and a radially outwardly extending protuberance in the tubular body located circumferentially between the reinforcing ribs at said opposite ends.
Claim 2
Dependent Claim
155 words
An ultra-lightweight metallic threaded fastener comprising: a thin-walled tubular body including a radially extending flange at one end of the tubular body; threaded body portions in which the wall thickness is no greater than the depth of the thread therein; effectively unthreaded body portions unitary with the threaded body portions and extending axially along the body for reinforcing the tubular body against axial loading, the unthreaded body portions including at least two reinforcing ribs projecting radially outwardly beyond the radial extent of the threaded body portions and extending axially between the flange and the opposite end of the tubular body; the radial extent of each rib being greatest at a location spaced axially from the flange toward said opposite end and decreasing between said location and the flange to provide an indentation adjacent the flange; and a radially outwardly extending protuberance in the tubular body located circumferentially between the reinforcing ribs at said opposite ends.
Claim 3
Dependent Claim
35 words
The invention of claim 1 wherein each rib has a generally U-shaped cross-sectional configuration as viewed in a radial plane, the bottom of the U-shaped configuration being at the radially outermost extent of the rib.
Claim 4
Dependent Claim
16 words
The invention of claim 1 including at least three threaded body portions and three reinforcing ribs.
Claim 5
Dependent Claim
35 words
The invention of claim 3 wherein each rib has a generally U-shaped cross-sectional configuration as viewed in a radial plane, the bottom of the U-shaped configuration being at the radially outermost extent of the rib.
Claim 6
Dependent Claim
27 words
The invention of claim 1 wherein the wall thickness of the unthreaded body portions are essentially the same as the wall thickness of the threaded body portions.
Claim 7
Dependent Claim
38 words
The invention of claim 1 including a radially extending surface on said flange facing the opposite end of the tubular body; and a member of thermoplastic synthetic resin material juxtaposed with the flange contiguous with said surface thereof.
Claim 8
Dependent Claim
38 words
The invention of claim 6 wherein the said member includes an annular disk portion extending along said surface and an integral generally tubular portion contiguous with at least a corresponding portion of the tubular body adjacent the flange.
Claim 9
Dependent Claim
27 words
The invention of claim 7 wherein said integral generally tubular portion of the member of thermoplastic synthetic resin material is divided into a plurality of axial projections.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |