US4091544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying process
Assignee: Procter and Gamble Co
•
Filing: 1977-02-11
•
Granted: 1978-05-30
•
Expires: 1997-02-11
Abstract
Abstract A process for drying a water-wet mixture of materials, at least one of which is hydratable, which allows the mixture to be easily formed into the desired size and shape and easily and safely dried.
Inventors
- 👤 James Peyton Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:04
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3945; F; F26; F26B; F26B5/00; F26B5/005; F26B7/00; F26B7/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A process for drying a mixture of materials comprising: A. forming a water-wet mixture of a hydratable material and a nonhydratable material at a temperature which is higher than the temperature of hydration of the hydratable material; B. forming the mixture of (A) into smaller units of the desired size and shape; C. decreasing the temperature of the units of (B) to a temperature which is at or below the hydration temperature of the hydratable material; and D. drying the units of (C) at a temperature high enough to remove the amount of free water and water of hydration which is desired but not high enough to cause the units to soften and stick together.
Claim 2
Dependent Claim
115 words
A process for drying a mixture of materials comprising: A. forming a water-wet mixture of a hydratable material and a nonhydratable material at a temperature which is higher than the temperature of hydration of the hydratable material; B. forming the mixture of (A) into smaller units of the desired size and shape; C. decreasing the temperature of the units of (B) to a temperature which is at or below the hydration temperature of the hydratable material; and D. drying the units of (C) at a temperature high enough to remove the amount of free water and water of hydration which is desired but not high enough to cause the units to soften and stick together.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein the hydratable material is selected from the group consisting of sodium sulfate, calcium bromide, ferric bromide, ferric chloride. ferric nitrate, lithium bromide, sodium acetate, sodium arsenate, sodium perborate, sodium phosphite, sodium acid phosphite and stannous chloride.
Claim 4
Dependent Claim
16 words
A process according to claim 2 wherein the nonhydratable material is a normally solid peroxyacid compound.
Claim 5
Dependent Claim
13 words
A process according to claim 3 wherein the hydratable material is sodium sulfate.
Claim 6
Dependent Claim
22 words
A process according to claim 4 wherein the peroxyacid compound is selected from the group consisting of diperdodecanedioic acid and diperazelaic acid.
Claim 7
Dependent Claim
18 words
A process according to claim 5 wherein an exotherm control agent is included in the mixture of (A).
Claim 8
Dependent Claim
29 words
A process according to claim 6 wherein the temperature of (C) is equal to or less than 90° F and the temperature of (D) is less than 130° F.
References Cited (Backward Citations)
US2825655A
Cited
US2882609A
Cited
US3137630A
Cited
US3770816A
Cited
US3923944A
Cited
US3963118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |