US4947524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient sheet-steel paper clip
Assignee: Individual
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Filing: 1990-01-19
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Granted: 1990-08-14
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Expires: 2010-01-19
Abstract
Abstract A paper clip is made of resilient sheet-steel which is bent into U-shaped structure. Two holes are punched on the upper portion of the U-shaped sheet-steel to define therewith a ridge portion which can be pressed to recess or bent to project over the level surface of the upper portion thereof so as to open the clip for the insertion therein of sheets of paper or close the clip to clamp sheets of paper. Corrugated portions are transversely and longitudinally formed on the upper portion and the lower portion of the clip respectively to reinforce its clamping effect.
Inventors
- 👤 Chin-Fu Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:39
CPC Classifications
B; B42; B42F; B42F1/00; B42F1/02; B42F1/04; Y; Y10; Y10T; Y10T24/00; Y10T24/20; Y10T24/202; Y10T24/205; Y10T24/44; Y10T24/44641; Y10T24/44769; Y10T24/44923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A paper clip made of resilient sheet-steel through punching and press work, having an U-shaped configuration including an upper portion and a lower portion, said upper portion comprising two slots defining therebetween a ridge portion, and a transversely corrugated portion vertical to said ridge portion, said lower portion comprising a longitudinally corrugated portion, wherein said upper portion has its front end spaced away from the front end of said lower portion when said ridge portion is pressed to recess from the level surface of said upper portion, and said upper portion has its front end closely engaged with the front end of said lower portion when said ridge portion is turned to project over the level surface of said upper portion.
Claim 2
Dependent Claim
121 words
A paper clip made of resilient sheet-steel through punching and press work, having an U-shaped configuration including an upper portion and a lower portion, said upper portion comprising two slots defining therebetween a ridge portion, and a transversely corrugated portion vertical to said ridge portion, said lower portion comprising a longitudinally corrugated portion, wherein said upper portion has its front end spaced away from the front end of said lower portion when said ridge portion is pressed to recess from the level surface of said upper portion, and said upper portion has its front end closely engaged with the front end of said lower portion when said ridge portion is turned to project over the level surface of said upper 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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |