US3913181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper clip having a coated inside loop surface
Assignee: Individual
•
Filing: 1973-11-29
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Granted: 1975-10-21
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Expires: 1993-11-29
Abstract
Abstract A paper clip of the kind having two resiliently biased gripping elements for gripping the opposite sides of paper sheets has a coating which increases the adhesion between the paper clip and the paper to which it is clipped. The coating is disposed on only an inside, paper contacting surface of one of the gripping elements. A method of applying the coating to the surface includes clipping the paper clip over a side edge of a conveyor belt and spraying or rolling the coating on the outer exposed surface of one of the gripping elements and then removing the clip from the conveyor belt so that the coated surface can be used as the paper contacting surface.
Inventors
- 👤 Brooks Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:19
CPC Classifications
B; B42; B42F; B42F1/00; B42F1/02; B42F1/04; B42F1/08; Y; Y10; Y10T; Y10T24/00; Y10T24/20; Y10T24/202; Y10T24/205; Y10T24/44; Y10T24/44641; Y10T24/44932
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A paper clip formed of a single wire bent to have an outer half loop and an internesting inner half loop at one end, a single half loop at the other end and two adjacent straight wire sections extending generally parallel to one another at each side of the paper clip between said opposite ends for forming the gripping elements in combination with the internesting outer and inner half loops at said one end, said papEr clip including a coating of non-metallic material for increasing the friction between the clip and the paper disposed on a portion not greater than half of the peripheral surface of that part of the wire which forms the straight wire sections and the internesting outer and inner half loops and wherein the coated portion of the peripheral surface of the inside half loop and straight wire sections is disposed on a side opposite to that of the outside half loop and straight wire sections so as to present opposed coated surfaces effective to grip the opposite sides of the paper inserted between the half loop ends and straight wire sections.
Claim 2
Dependent Claim
186 words
A paper clip formed of a single wire bent to have an outer half loop and an internesting inner half loop at one end, a single half loop at the other end and two adjacent straight wire sections extending generally parallel to one another at each side of the paper clip between said opposite ends for forming the gripping elements in combination with the internesting outer and inner half loops at said one end, said papEr clip including a coating of non-metallic material for increasing the friction between the clip and the paper disposed on a portion not greater than half of the peripheral surface of that part of the wire which forms the straight wire sections and the internesting outer and inner half loops and wherein the coated portion of the peripheral surface of the inside half loop and straight wire sections is disposed on a side opposite to that of the outside half loop and straight wire sections so as to present opposed coated surfaces effective to grip the opposite sides of the paper inserted between the half loop ends and straight wire sections.
Claim 3
Dependent Claim
13 words
The invention defined in claim 1 wherein the coating is a rubber composition.
Claim 4
Dependent Claim
33 words
The invention defined in claim 1 wherein the coating is an adhesive which adheres to the paper or other sheet material but does not stick to the paper when the clip is removed.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |