Water heater having highly efficient and compact heat exchanger

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11761677
SERIAL NO

17782046

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A water heater includes an inner water tube coil and an outer water tube coil separated by a drum baffle. The inner and outer coils extend above a top edge of the drum baffle by at least a full turn of each coil. A flue gas bypass path is defined between a top edge of the drum baffle and a top insulation layer above the inner and outer coils. Flue gases flow radially though the inner coil, up along the drum baffle, through the flue gas bypass path, and downwardly over the outer coil to heat water flowing through the inner and outer coils. The water flows into the outer coil at the bottom of the coil, winds upwardly through the outer coil in countercurrent flow with respect to the flue gases, then down through the inner coil.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddress
A O SMITH CORPORATION11270 WEST PARK PLACE MILWAUKEE WI 53224

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Yonghua Fergus, CA 4 21
Doura, Mohamed Mehdi Lebanon, US 5 5
Fu, Ziwen Nanjing, CN 5 0
Li, Tingyu Nanjing, CN 11 78
Xiao, Jun Nanjing, CN 183 2390
Yin, Jianmin Milwaukee, US 24 216

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
3.5 Year Payment $1600.00 $800.00 $400.00 Mar 19, 2027
7.5 Year Payment $3600.00 $1800.00 $900.00 Mar 19, 2031
11.5 Year Payment $7400.00 $3700.00 $1850.00 Mar 19, 2035
Fee Large entity fee small entity fee micro entity fee
Surcharge - 3.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
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