US5909992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tapping screw for fastening a metal corrugated board
Assignee: Individual
•
Filing: 1998-07-02
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Granted: 1999-06-08
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Expires: 2018-07-02
Abstract
Abstract A self-tapping screw consists of a head and a threaded shank which is provided with a blade, a first threaded portion contiguous to the blade, and a second threaded portion contiguous to the head and greater in length, tooth pitch and tooth depth than the first threaded portion. The self-tapping screw is fastened onto a corrugated board such that the blade and the first threaded portion are securely embedded in a girder, and that the second threaded portion is securely embedded in an insulation layer located between the corrugated board and the girder.
Inventors
- 👤 Tsan-Hsing Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:06
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/36; E04D3/3601; E04D3/3603; F; F16; F16B; F16B25/00; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0042; F16B25/0057; F16B25/0073; F16B25/10; F16B25/103; F16B35/00; F16B35/04; F16B35/041
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A self-tapping screw having a head, and a threaded shank fastened at one end thereof with said head and provided at another end thereof with a blade fastened therewith; wherein said threaded shank is provided with a first threaded portion contiguous to said blade, and a second threaded portion contiguous to said head and greater in tooth pitch and tooth depth than said first threaded portion, wherein said second threaded portion is of a tapered construction.
Claim 2
Dependent Claim
76 words
A self-tapping screw having a head, and a threaded shank fastened at one end thereof with said head and provided at another end thereof with a blade fastened therewith; wherein said threaded shank is provided with a first threaded portion contiguous to said blade, and a second threaded portion contiguous to said head and greater in tooth pitch and tooth depth than said first threaded portion, wherein said second threaded portion is of a tapered construction.
Claim 3
Dependent Claim
21 words
The self-tapping screw as defined in claim 1, wherein said head has a circular base fastened with said second threaded portion.
Claim 4
Dependent Claim
22 words
The self-tapping screw as defined in claim 1, wherein said second threaded portion is greater in length than said first threaded portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-06-07 | 2002-12-07 | 2003-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-06-07 | 2006-12-07 | 2007-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-06-07 | 2010-12-07 | 2011-06-08 | $7700.00 | Window Closed / Lapsed |