US3736769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling device
Assignee: Union Carbide Corp
•
Filing: 1971-07-01
•
Granted: 1973-06-05
•
Expires: 1991-07-01
Abstract
Abstract A cooling device is provided having a core of a cold storing material sandwiched between two thin, flexible walls having different heat transfer rates such that one side of the cooling device is colder to the touch than the opposite side of the device.
Inventors
- 👤 D Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:14
CPC Classifications
F; F25; F25D; F25D3/00; F25D2303/00; F25D2303/08; F25D2303/082; F25D2303/0822
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
A cooling device comprising at least one layer of a cold storing material sealed within a container of two flexible thermoplastic walls heat sealed to each other around their common periphery, one of said walls being breathable film, and the other of said walls being an air-impermeable film.
Claim 2
Dependent Claim
48 words
A cooling device comprising at least one layer of a cold storing material sealed within a container of two flexible thermoplastic walls heat sealed to each other around their common periphery, one of said walls being breathable film, and the other of said walls being an air-impermeable film.
Claim 3
Dependent Claim
13 words
A device according to claim 1 wherein the walls are of polyolefinic film.
Claim 4
Dependent Claim
13 words
A device according to claim 2 wherein the walls are of polyethylene film.
References Cited (Backward Citations)
US2006706A
Cited
US2203591A
Cited
US2463161A
Cited
US2697424A
Cited
GB952455A
Cited
US3258065A
Cited
US3545230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |