US4545916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat storage materials
Assignee: IC Gas International Ltd
•
Filing: 1983-07-12
•
Granted: 1985-10-08
•
Expires: 2003-07-12
Abstract
Abstract The heat storage material, which undergoes reproducible transition in the range 66° to 74° C., comprises sodium pyrophosphate decahydrate (Na 4 P 2 O 7 .10 H 2 O) dispersed throughout an open cell polymeric matrix which is stable in an aqueous medium at 80° C. In use (for example, for space heating) the material is alternately heated to above 80° C. and cooled below its transition temperature with evolution of heat.
Inventors
- 👤 Christine D. Chalk
- 👤 Cecil Hayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:31
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A heat storage material which comprises sodium pyrophosphate decahydrate dispersed throughout an open cell polymeric matrix which is stable in an aqueous medium at 80° C., the polymeric matrix being present in a minor amount.
Claim 2
Dependent Claim
35 words
A heat storage material which comprises sodium pyrophosphate decahydrate dispersed throughout an open cell polymeric matrix which is stable in an aqueous medium at 80° C., the polymeric matrix being present in a minor amount.
Claim 3
Dependent Claim
19 words
A heat storage material according to claim 1, in which the polymeric matrix comprises a water-swollen cross-linked polymer hydrogel.
Claim 4
Dependent Claim
35 words
A method of heat exchange which comprises alternately heating a material according to claim 1 or 2 to a temperature of above 80° C., and allowing said material to cool below the transition temperature thereof.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |