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  <xsd:element abstract="true" id="ipwr_PatentsYetToBeAwardedMember" name="PatentsYetToBeAwardedMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_PerformanceStockUnitsPSUsMember" name="PerformanceStockUnitsPSUsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_PrefundedWarrantsMember" name="PrefundedWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_PrivatePlacementPrefundedWarrantsMember" name="PrivatePlacementPrefundedWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ipwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="instant"/>
  <xsd:element id="ipwr_StockForfeitedDuringPeriodSharesExerciseOfWarrants" name="StockForfeitedDuringPeriodSharesExerciseOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="ipwr_StockIssuedDuringPeriodSharesExerciseOfWarrants" name="StockIssuedDuringPeriodSharesExerciseOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="ipwr_StockIssuedDuringPeriodValueExerciseOfWarrants" name="StockIssuedDuringPeriodValueExerciseOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_The2013EquityIncentivePlanMember" name="The2013EquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_UnderwrittenPublicOfferingPrefundedWarrantsMember" name="UnderwrittenPublicOfferingPrefundedWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ipwr_WarrantsDisclosureTextBlock" name="WarrantsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="ipwr_WarrantsIssuedPricePerWarrant" name="WarrantsIssuedPricePerWarrant" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-3-intangible-assets-net-tables" name="statement-statement-note-3-intangible-assets-net-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-3-intangible-assets-schedule-of-intangible-assets-net-details" name="statement-statement-note-3-intangible-assets-schedule-of-intangible-assets-net-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-4-lease-future-minimum-payments-details" name="statement-statement-note-4-lease-future-minimum-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-4-lease-tables" name="statement-statement-note-4-lease-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-7-equity-incentive-plan-other-award-activity-details" name="statement-statement-note-7-equity-incentive-plan-other-award-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-7-equity-incentive-plan-stock-option-activity-details" name="statement-statement-note-7-equity-incentive-plan-stock-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-note-7-equity-incentive-plan-tables" name="statement-statement-note-7-equity-incentive-plan-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ipwr_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
