An article in the form of a paper substrate having a first surface and a second surface; an internal paper sizing agent present in an amount sufficient to impart to the paper substrate an HST value of from about 50 to about 250 seconds; one or more optical brightening agents present in an amount below a â€œgreen overâ€ effect excess but sufficient to impart an ISO Brightness value of at least about 92; and a metal salt drying agent mixture of multivalent and monovalent metal drying salts in a molar ratio of multivalent to monovalent cations of from about 3:1 to about 1:18 to provide a percent ink transferred (â€œIT %â€ ) value equal to or less than about 65% and a black print density value of at least about 1.45. Also, a method for treating the optically brightened paper substrate with a mixture of multivalent and monovalent metal drying salts.

Claims

28 · 1 independent · depth 10

28 granted claims

›1.independentAn article comprising:na paper substrate having a first surface and a second surface;an internal paper sizing agent present in an amount sufficient to…+27

›2.↳ 1The article of claim 1, wherein the molar ratio of multivalent cations to monovalent cations is in the range from about 1.5:1 to about 1:12.d2+10

›3.↳ 2The article of claim 2, wherein the metal salt drying agent is present on both the first and second surfaces.d3+9

›4.↳ 3The article of claim 3, wherein the metal salt drying agent is present in an amount sufficient to provide coverage on each of the first and second sur…d4

›5.↳ 3The article of claim 3, wherein the metal salt drying agent is present in an amount sufficient to provide coverage on each of the first and second sur…d4

›6.↳ 3The article of claim 3, wherein the monovalent salts comprise a sodium salt, a potassium salt, or a lithium salt.d4+6

›13.↳ 1The article of claim 1, wherein the metal salt drying agent is present on the at least one of the first and second surfaces in an amount sufficient to…d2+1

›15.↳ 1The article of claim 1, wherein the metal salt drying agent is present on the at least one of the first and second surfaces to provide a black print d…d2+1

›17.↳ 1The article of claim 1, wherein the metal salt drying agent present on the at least one of the first and second surfaces to provide an edge acuity (EA…d2+1

›19.↳ 1The article of claim 1, wherein the internal paper sizing agent is present in an amount sufficient to impart to the paper substrate an HST value of fr…d2

›20.↳ 1The article of claim 1, wherein the one or more optical brightening agents are present in an amount sufficient to impart an ISO Brightness value of at…d2+1

›22.↳ 1The article of claim 1, wherein the one or more optical brightening agents comprise one or more of 4,4⬲-bis-(triazinylamino)-stilbene-2,2⬲-disulfonic …d2

›23.↳ 1The article of claim 1, wherein the one or more optical brightening agents comprise one or more stilbene-based sulfonates.d2+1

›25.↳ 1The article of claim 1, wherein the one or more optical brightening agents are present on each of the first and second surfaces in an amount of from a…d2+1

›27.↳ 1The article of claim 1, wherein the one or more optical brightening agents are present in an amount sufficient to impart a CIE Whiteness value of at l…d2+1

Classifications

4 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B41M5/00

USPC · US Patent Classification

428/32.18428/32.3428/32.21

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this patent are not paired with the granted ones in what we hold.

File wrapper

Pendency

3.4 y

1,251 days filing → grant

Office actions

after a restriction

Responses

5 RCE

Examiner

Betelhem Shewareged

art unit 1785 · TC 1700

Law firm

Law firm · Log in to unlock

Citations: 96 back · 0 forward

See the full prosecution history — every USPTO and applicant action on this file, in order.

Term & fees

See the term timeline — pendency span, in-force span, the maintenance fees paid and both computed expiry dates.

Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110151149 A1	23 Jun 2011

Validity challenges

See the validity challenges on record — reexaminations, IPRs and PGRs, with their institution decisions and outcomes.

Citations

See every patent this one cites and every patent that cites it back — publication, assignee, and how each one was found.