Variable resistance device for a high pressure air supply system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Jun 22, 2000
filing date -
Jun 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable resistance device for use in a duct of a high pressure air supply system employs a rotatable butterfly damper locatable in the air supply system having a closed and an open position for variably restricting airflow through the air supply system. The butterfly damper is provided with apertures which permit air to flow through the butterfly damper even when it is in a closed position. The apertures are sized to provide a maximum resistance value at a minimum air flow rate in a closed position, a minimum resistance value at a maximum air flow rate in a 70% open position, and a nearly linear relationship between an angular rotation position of the butterfly damper and resistance.
First Claim
all claims..Other Claims data not available
Family
- No Family data available.
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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THE BABCOCK & WILCOX POWER GENERATION GROUP INC | 20 S VAN BUREN AVENUE BARBERTON OH 44203 |
International Classification(s)

- 2000 Application Filing Year
- F15D Class
- 28 Applications Filed
- 12 Patents Issued To-Date
- 42.86 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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DeSellem, James Frederick | Lisbon, OH | 1 | 12 |
# of filed Patents : 1 Total Citations : 12 |
Cited Art Landscape
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Patent Citation Ranking
- 12 Citation Count
- F15D Class
- 66.67 % this patent is cited more than
- 24 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

Legal Events
Date | Code | Event | Description |
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Jun 28, 2021 | MAFP | MAINTENANCE FEE PAYMENT | free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY year of fee payment: 4 |
Dec 26, 2017 | I | Issuance | |
Dec 06, 2017 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
Mar 05, 2015 | P | Published | |
Dec 12, 2014 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HILBRINK, MARCEL;XU, REX;ALVARADO, CESAR;AND OTHERS;SIGNING DATES FROM 20141119 TO 20141205;REEL/FRAME:034497/0046 Owner name: UNIVERSAL ELECTRONICS INC., CALIFORNIA |
Nov 07, 2014 | F | Filing | |
Sep 14, 2012 | AS | ASSIGNMENT | free format text: SECURITY INTEREST;ASSIGNOR:UNIVERSAL ELECTRONICS INC.;REEL/FRAME:067417/0402 Owner name: U.S. BANK NATIONAL ASSOCIATION, CALIFORNIA Effective Date: Sep 14, 2012 |

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