US3716202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically attracted bobbins
Assignee: Mississippi State University
•
Filing: 1971-01-13
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Granted: 1973-02-13
•
Expires: 1991-01-13
Abstract
Abstract Disposable magnetically affected sewing bobbins formed of paper or plastic impregnated or coated with particulate iron powder or other magnetically affected material.
Inventors
- 👤 C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:41
CPC Classifications
D; D05; D05B; D05B57/00; D05B57/28; B; B65; B65H; B65H75/00; B65H75/02; B65H75/04; B65H75/08; B65H75/14; B65H2701/00; B65H2701/30; B65H2701/31; B65H2701/50; B65H2701/51; B65H2701/511; B65H2701/5112; D05D; D05D2207/00; D05D2207/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
A magnetically affected disposable paper bobbin, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
Claim 2
Dependent Claim
21 words
A magnetically affected disposable paper bobbin, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
Claim 3
Dependent Claim
15 words
The bobbin of claim 1 wherein the magnetically affected material is dispersed in the paper.
Claim 4
Dependent Claim
14 words
The bobbin of claim 2 wherein the magnetically affected material is an iron compound.
Claim 5
Dependent Claim
12 words
The bobbin of claim 3 wherein the iron compound is iron powder.
Claim 6
Dependent Claim
24 words
The bobbin of claim 1 wherein the magnetically affected material is present in a coating on all of the exterior surfaces of the bobbin.
Claim 7
Dependent Claim
14 words
The bobbin of claim 5 wherein the magnetically affected material is an iron compound.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |