Earl E Allen

US Patent:

44874189, Dec 11, 1984

Filed:

Apr 30, 1984

Appl. No.:

6/605481

Inventors:

Earl E. Allen - Houston TX

International Classification:

A63F 300
A63F 918
G09B 302

US Classification:

273242

Abstract:

An educational apparatus is disclosed including a base, a question/answer disc, a cover disc and a pointer all disposed on a post screw stacked from bottom to top in the order listed. The base displays a circle of numbered question/answer blocks which may be seen around the question/answer disc. The question/answer disc displays radial question/answer segments corresponding to the numbers in the question/answer blocks on the base. The question/answer segments are divided radially into a single question subsegment and a single answer subsegment. The cover disc has a window through which to view a single question displayed radially within the question subsegment. After the answer to the question has been attempted, the window in the cover disc is moved clockwise to reveal the correct answer in the answer subsegment. This answer is compared with the attempted answer. The question/answer discs are exchangeable.

US Patent:

54512425, Sep 19, 1995

Filed:

May 2, 1994

Appl. No.:

8/243336

Inventors:

Douglas W. Ming - Houston TX
Donald L. Henninger - Houston TX
Earl R. Allen - Stillwater OK
Dadigamuwage C. Golden - Houston TX

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

C05B 700
C01B 1516
B01J 2906

US Classification:

71 36

Abstract:

A synthetic soil/fertilizer for horticultural application having all the agronutrients essential for plant growth is disclosed. The soil comprises a synthetic apatite fertilizer having sulfur, magnesium and micronutrients dispersed in a calcium phosphate matrix, a zeolite cation exchange medium saturated with a charge of potassium and nitrogen cations, and an optional pH buffer. Moisture dissolves the apatite and mobilizes the nutrient elements from the apatite matrix and the zeolite charge sites.