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Minneapolis, MN, United States of America

David E Carmein

USPTO Granted Patents = 8 (Patent Applications = 1)

Average Co-Inventor Count = 1.4

ph-index = 8

Forward Citations = 993(Granted Patents)

Location History:

Minneapolis, MN (US) (1988 - 1996)
Bloomington, MN (US) (1999 - 2000)

Company Filing History:

Recovery Engineering, Inc.

4 out of 832,680

Other

patents

Years Active: 1988-2000

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8 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6152854 - Omni-directional treadmill (2000-11-28),

2. 5980256 - Virtual reality system with enhanced sensory apparatus (1999-11-09),

3. 5562572 - Omni-directional treadmill (1996-10-08),

4. 5490784 - Virtual reality system with enhanced sensory apparatus (1996-02-13),

5. 5106500 - Portable water purification system including a filter cleaning mechanism (1992-04-21),

6. 4945725 - Differential-area piston type mixed-phase motors (1990-08-07),

7. 4902207 - Energy recovery apparatus (1990-02-20),

8. 4793153 - Energy recovery apparatus (1988-12-27),

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