US5498512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic element having a transparent magnetic recording layer
Assignee: Eastman Kodak Co
•
Filing: 1995-03-10
•
Granted: 1996-03-12
•
Expires: 2015-03-10
Abstract
Abstract A photographic element having a light-sensitive layer and a transparent magnetic recording layer, the transparent magnetic recording layer comprising ferromagnetic particles having a ferromagnetic core and a shell of tin oxide or metal antimonate in a binder.
Inventors
- 👤 Robert O. James
- 👤 Lawrence A. Rowley
- 👤 George L. Oltean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:58
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; G; G03; G03C; G03C11/00; G03C11/02; G11; G11B; G11B5/00; G11B5/62; G11B5/633; H04B1/7087; H04B1/709; H04B1/7097; H04B1/711; H04B1/7115; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2332; H04L27/0014; H04L2027/0024; H04L2027/0026; H04L2027/003; H04L2027/0044; H04L2027/0046; H04L2027/0063; H04L2027/0065; H04L2027/0071; H04L2027/0079
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
37 words
A photographic element having a light-sensitive layer and a transparent magnetic recording layer, the transparent magnetic recording layer comprising ferromagnetic particles having a ferromagnetic core and a shell of tin oxide or metal antimonate in a binder.
Claim 2
Dependent Claim
37 words
A photographic element having a light-sensitive layer and a transparent magnetic recording layer, the transparent magnetic recording layer comprising ferromagnetic particles having a ferromagnetic core and a shell of tin oxide or metal antimonate in a binder.
Claim 3
Dependent Claim
12 words
The photographic element of claim 1 wherein the shell is tin oxide.
Claim 4
Dependent Claim
16 words
The photographic element of claim 2 wherein the tin oxide is an antimony doped tin oxide.
Claim 5
Dependent Claim
13 words
The photographic element of claim 1 wherein the shell is a metal antimonate.
Claim 6
Dependent Claim
75 words
The photographic element of claim 4 wherein the metal antimonate has the formula M +2 Sb +5 2 O 6 or M +3 Sb +5 O 4 where M +2 is Zn +2 , Ni +2 , Mg +2 , Fe +2 , Cu +2 , Mn +2 or Co +2 , and M +3 is In +3 , Al +3 , Sc +3 , Cr +3 , Fe +3 , or Ga +3 .
Claim 7
Dependent Claim
16 words
The photographic element of claim 4 wherein the metal antimonate is ZnSb 2 O 6 .
Claim 8
Dependent Claim
14 words
The photographic element of claim 4 wherein the metal antimonate is InSbO 4 .
Claim 9
Dependent Claim
24 words
The photographic element of claim 1 wherein the shell material is from 0.1 to percent by weight based on the weight of the core.
Claim 10
Dependent Claim
24 words
The photographic element of claim 1 wherein the shell material is from 0.5 to 15% by weight based on the weight of the core.
Claim 11
Dependent Claim
24 words
The photographic element of claim 1 wherein the shell material is from 1 to 10% by weight based on the weight of the core.
Claim 12
Dependent Claim
13 words
The photographic element of claim 1 wherein the ferromagnetic core is iron oxide.
Claim 13
Dependent Claim
15 words
The photographic element of claim 11 wherein the iron oxide is Co-surface treated iron oxide.
Claim 14
Dependent Claim
27 words
The photographic element of claim 1 wherein the ferromagnetic particles are present in an amount of from 1:2 to 1:100 based on the weight of the binder.
Claim 15
Dependent Claim
28 words
The photographic element of claim 1 wherein the ferromagnetic core is magnetic iron oxide containing Fe 2+ in an amount of 3-24 wt % of the ferromagnetic core.
Claim 16
Dependent Claim
29 words
The photographic element of claim 1 wherein the ferromagnetic core is cobalt-modified magnetic iron oxide containing Fe 2+ in an amount of 3-24 wt. % of the ferromagnetic core.
Claim 17
Dependent Claim
13 words
The photographic element of claim 1 wherein the ferromagnetic core is chromium dioxide.
Claim 18
Dependent Claim
20 words
The photographic element of claim 1 wherein a silicon dioxide layer is disposed between the ferromagnetic core and the shell.
Claim 19
Dependent Claim
26 words
The photographic element of claim 17 wherein the silicon dioxide layer is from 0.1 to 10 percent by weight based on the weight of the core.
Claim 20
Dependent Claim
26 words
The photographic element of claim 17 wherein the silicon dioxide layer is from 0.5 to 2 percent by weight based on the weight of the core.
References Cited (Backward Citations)
US3782947A
Cited
US4279945A
Cited
US4302523A
Cited
US4917952A
Cited
US4990276A
Cited
US5147768A
Cited
US5229259A
Cited
US5252441A
Cited
US5382494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |