US4100088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging composition
Assignee: Xerox Corp
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Filing: 1976-07-02
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Granted: 1978-07-11
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Expires: 1996-07-02
Abstract
Abstract A composition responsive to magnetic fields and comprising a ferrofluid and metal flakes. The metal flakes align with the ferrofluid in response to magnetic lines of force and along the magnetic lines of force. Excellent contrast is provided between portions of the composition wherein the metal flakes are seen along edges or ends and portions of the composition wherein the broad surface area of the flakes are presented to view.
Inventors
- 👤 Werner E. L. Haas
- 👤 Gary A. Dir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/83; G01N27/84
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
An imaging composition consisting essentially of a ferrofluid and metal flakes, said metal flakes being detached from magnetic particles suspended in said ferrofluid and capable of being aligned in the direction of a magnetic field to which said ferrofluid is subjected.
Claim 2
Dependent Claim
41 words
An imaging composition consisting essentially of a ferrofluid and metal flakes, said metal flakes being detached from magnetic particles suspended in said ferrofluid and capable of being aligned in the direction of a magnetic field to which said ferrofluid is subjected.
Claim 3
Dependent Claim
9 words
The composition of claim 1 further including a diluent.
Claim 4
Dependent Claim
31 words
The composition of claim 2 comprising by weight from about 80% to about 98.5% diluent, from about 0.5% to about 8.5% ferrofluid, and from about 1% to about 16% metal flakes.
Claim 5
Dependent Claim
10 words
The composition of claim 2 wherein said diluent comprises water.
Claim 6
Dependent Claim
23 words
The composition of claim 4 wherein by weight said ferrofluid comprises about 10% and said metal flakes comprise about 10% of said composition.
Claim 7
Dependent Claim
12 words
The composition of claim 3 wherein said diluent comprises a hydrocarbon liquid.
Claim 8
Dependent Claim
29 words
The composition of claim 6 wherein by weight said composition comprises about one part ferrofluid, about one part metal flakes and from about 10 to about 50 parts diluent.
Claim 9
Dependent Claim
29 words
The composition of claim 6 wherein by weight said composition comprises about one part ferrofluid, about two parts metal flakes and from about 40 to about 200 parts diluent.
Claim 10
Dependent Claim
29 words
The composition of claim 6 wherein by weight said composition comprises about one part ferrofluid, about four parts metal flakes and from about 40 to about 200 parts diluent.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |