Patent US3541513A successfully refreshed from Google Patents.
US4516564A
Expired / Lapsed
US
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Heat generating body
Assignee: Japan Pionics Ltd
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Filing: 1982-09-14
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Granted: 1985-05-14
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Expires: 2002-09-14
Abstract
Abstract A heat generating body suitable for use as a body warmer or the like. The heat generating body is composed of a closed bag locally provided with at least one air permeable portion constituted by a group of fine pores of a diameter equivalent of not more than 20 microns, and a heat generating composition accommodated in the bag.
Inventors
- 👤 Yasuhiko Koiso
- 👤 Kenji Ohtsuka
- 👤 Shigeo Yahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/02; A61F7/03; A61F7/032; A61F7/034
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A heat generating body comprising: a heat generating composition for generating heat upon contact with oxygen; a bag storing said heat generating composition, said bag comprising: an air-permeable film with at least one window or holes, each of said holes having a diameter ranging between 0.05 and 50 mm; and a microporous film covering and closing the window or holes, said microporous film having fine pores, each said pore having a diameter equivalent ranging between 0.005 and 5 microns; and an outer cover with air-impermeability covering said bag, said outer cover being adapted to be removed from said bag when used.
Claim 2
Dependent Claim
101 words
A heat generating body comprising: a heat generating composition for generating heat upon contact with oxygen; a bag storing said heat generating composition, said bag comprising: an air-permeable film with at least one window or holes, each of said holes having a diameter ranging between 0.05 and 50 mm; and a microporous film covering and closing the window or holes, said microporous film having fine pores, each said pore having a diameter equivalent ranging between 0.005 and 5 microns; and an outer cover with air-impermeability covering said bag, said outer cover being adapted to be removed from said bag when used.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |