US3905520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum flask provided with a pumping device
Assignee: NATIONAL MAHOOBIN KOGYO KK
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Filing: 1974-04-10
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Granted: 1975-09-16
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Expires: 1994-04-10
Abstract
Abstract This invention is directed to a vaccum flask capable of pouring a liquid contained therein into a drinking cup without tilting the flask by simply working a bellow element from the outside while the flask stands upright on a table. The bellows element is removably fixed inside the lid of the flask, independent of the plug and the internal vessel.
Inventors
- 👤 Naruo Nishioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
A; A47; A47J; A47J41/00; A47J41/0005; A47J41/0027; A47J41/0033; B; B67; B67D; B67D1/00; B67D1/04; B67D1/0412; B67D1/0425
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A vacuum flask comprising an internal doublewalled vessel provided with a lid, a bellows element removably and completely housed in said lid, said bellows element having first and second converging open ends, a plug removably disposed in the opening of said double-walled vessel, said plug being provided with an aperture communicating with the inside of said double-walled vessel and said bellows element when the lid is in the closed position, a tube embedded in said plug for allowing a liquid contained in said vessel to be pumped therefrom, said tube communicating to an outlet tube, a check valve floatingly confined in said first converging open end of said bellows element, said check valve being adapted to close up said first coverging open end of the bellows element under the backpressure produced by said bellows element, said second converging open end of said bellows element and said aperture in said plug being in aligment when the lid is closed over said double-walled vessel.
Claim 2
Dependent Claim
162 words
A vacuum flask comprising an internal doublewalled vessel provided with a lid, a bellows element removably and completely housed in said lid, said bellows element having first and second converging open ends, a plug removably disposed in the opening of said double-walled vessel, said plug being provided with an aperture communicating with the inside of said double-walled vessel and said bellows element when the lid is in the closed position, a tube embedded in said plug for allowing a liquid contained in said vessel to be pumped therefrom, said tube communicating to an outlet tube, a check valve floatingly confined in said first converging open end of said bellows element, said check valve being adapted to close up said first coverging open end of the bellows element under the backpressure produced by said bellows element, said second converging open end of said bellows element and said aperture in said plug being in aligment when the lid is closed over said double-walled vessel.
Claim 3
Dependent Claim
57 words
The vacuum flask as claimed in claim 1, wherein the plug contains a trunk, said trunk being provided with a plurality of projections thereon so as to produce a gap between said trunk and the inside wall surface of said double-walled vesesl, and a ring-shaped flange disposed above said projections so as to cover up said gap.
Claim 4
Dependent Claim
43 words
The vacuum flask as claimed in claim 1, wherein the bellows element is supported by a covering means in screw engagement with said lid, said covering means having an aperture taking the place of said second converging open end of the bellows element.
Claim 5
Dependent Claim
35 words
The vacuum flask as claimed in claim 1, wherein the check valve has the shape of an inverted T-letter, having its leg portion projecting outside from said first converging open end of the bellows element.
Claim 6
Dependent Claim
59 words
A vacuum flask as claimed in claim 3, wherein the aperture in the plug is surrounded by ring-shaped projections, and the aperture provided in said second converging open end of the bellows element is produced of elastic material, thereby enabling said projections to be embedded in said elastic element when the lid is applied over the internal double-walled vessel.
Claim 7
Dependent Claim
33 words
A vacuum flask as claimed in claim 1, wherein the tube is located in the rim portion of the plug facing the outlet, thereby shortening the distance from said tube to said outlet.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |