Patent US5477033A successfully refreshed from Google Patents.
US5477033A
Expired / Lapsed
US
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Encapsulated water impervious electrical heating pad
Assignee: KEN-BAR Inc
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Filing: 1993-10-19
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Granted: 1995-12-19
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Expires: 2013-10-19
Abstract
Abstract An encapsulated water impervious electrical heating pad adapted for use in moist and rough handling conditions, as in a greenhouse environment includes an electrical resistance heating element sandwiched between a pair of sheets, the sheets having inner layers formed from a tacky pressure-sensitive adherent material and an outer protective layer of a water impervious polymer.
Inventors
- 👤 Peter Bergholtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:06
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; H05B2203/00; H05B2203/002; H05B2203/003; H05B2203/013; H05B2203/014; H05B2203/017
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A flexible, water impervious heating pad comprising: an electrical resistance heating element; a pair of sheets disposed on opposite sides of the heating element and sandwiching the heating element between the sheets, each of the sheets comprising an inner layer formed from a pressure sensitive adhesive hydrophobic material and an outer protective flexible water impervious layer; the sheets being bonded to the heating element and to each other; the sheets extending about the heating element to form a sealed margin substantially fully about the heating element; the adhesive being flowable to facilitate self-sealing of a puncture through the pad.
Claim 2
Dependent Claim
99 words
A flexible, water impervious heating pad comprising: an electrical resistance heating element; a pair of sheets disposed on opposite sides of the heating element and sandwiching the heating element between the sheets, each of the sheets comprising an inner layer formed from a pressure sensitive adhesive hydrophobic material and an outer protective flexible water impervious layer; the sheets being bonded to the heating element and to each other; the sheets extending about the heating element to form a sealed margin substantially fully about the heating element; the adhesive being flowable to facilitate self-sealing of a puncture through the pad.
Claim 3
Dependent Claim
15 words
A heating pad as defined in claim 1 wherein the inner layer comprises rubberized asphalt.
Claim 4
Dependent Claim
25 words
A heating pad as defined in claim 2 wherein the protective outer layer comprises a polymeric sheet having a thickness less than the inner layer.
Claim 5
Independent Claim
110 words
A method for making a water resistant heating pad comprising: providing a pair of sheets, each sheet having an inner layer formed from a pressure sensitive adhesive hydrophobic material and an outer protective flexible polymeric sheet, the adhesive material being flowable to facilitate self-sealing of a puncture through the pad; applying a heater element to the inner layer of one of the sheets; applying the inner layer of the other of the sheets against the inner layer of the first sheet and the heating element; pressing the two sheets and heater element together without applying heat sufficiently to assure complete waterproof encapsulation of the heating element within the heating pad.
Claim 6
Independent Claim
110 words
A method for making a water resistant heating pad comprising: providing a pair of sheets, each sheet having an inner layer formed from a pressure sensitive adhesive hydrophobic material and an outer protective flexible polymeric sheet, the adhesive material being flowable to facilitate self-sealing of a puncture through the pad; applying a heater element to the inner layer of one of the sheets; applying the inner layer of the other of the sheets against the inner layer of the first sheet and the heating element; pressing the two sheets and heater element together without applying heat sufficiently to assure complete waterproof encapsulation of the heating element within the heating pad.
Claim 7
Dependent Claim
14 words
A method as defined in claim 4 wherein the adhesive layer comprises rubberized asphalt.
Claim 8
Dependent Claim
21 words
A method as defined in claim 5 wherein the sheets are polymeric and have a thickness less than the adhesive layer.
Claim 9
Dependent Claim
102 words
A flexible, water impervious heating pad comprising; an electrical resistance element: a pair of sheets disposed on opposite sides of the heating element and sandwiching the heating element between the sheets, each of the sheets having an outer protective flexible water impervious layer; an inner layer of pressure sensitive adhesive hydrophobic material disposed between the sheets and bonding the sheets to each other to encapsulate the heating element between the sheets the adhesive being flowable to facilitate self-sealing of a puncture through the pad; the sheets extending about the heating element to form a sealed margin substantially fully about the heating element.
Claim 10
Dependent Claim
102 words
A flexible, water impervious heating pad comprising; an electrical resistance element: a pair of sheets disposed on opposite sides of the heating element and sandwiching the heating element between the sheets, each of the sheets having an outer protective flexible water impervious layer; an inner layer of pressure sensitive adhesive hydrophobic material disposed between the sheets and bonding the sheets to each other to encapsulate the heating element between the sheets the adhesive being flowable to facilitate self-sealing of a puncture through the pad; the sheets extending about the heating element to form a sealed margin substantially fully about the heating element.
Claim 11
Independent Claim
100 words
A method for making a water resistant heating pad comprising: providing a pair of sheets, each having an outer protective flexible polymeric layer; disposing a heating element between the sheets; providing an inner layer, formed from a pressure sensitive adhesive hydrophobic material between the outer sheets, the adhesive material being flowable to facilitate sealing of a puncture through the pad; pressing the two sheets and heater element together to effect a sandwich of the sheets, inner layer and pressure sensitive adhesive hydrophobic material without applying heat, sufficiently to assure complete waterproof encapsulation of the heating element within the heating pad.
Claim 12
Independent Claim
100 words
A method for making a water resistant heating pad comprising: providing a pair of sheets, each having an outer protective flexible polymeric layer; disposing a heating element between the sheets; providing an inner layer, formed from a pressure sensitive adhesive hydrophobic material between the outer sheets, the adhesive material being flowable to facilitate sealing of a puncture through the pad; pressing the two sheets and heater element together to effect a sandwich of the sheets, inner layer and pressure sensitive adhesive hydrophobic material without applying heat, sufficiently to assure complete waterproof encapsulation of the heating element within the heating pad.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |