Patent US3689945A successfully refreshed from Google Patents.
US3689945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stretchers
Assignee: Individual
•
Filing: 1970-08-27
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Granted: 1972-09-12
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Expires: 1990-08-27
Abstract
Abstract A stretcher with a vacuum mattress and carrier poles for it, the vacuum mattress having an air impermeable cover enclosing an interior which can alternatively be filled with air or evacuated by a vacuum pump, and which contains a granular material. In order that it should always be available, independent of human factors, when the stretcher is used, and should be capable of connection to the mattress as a preparatory measure, a vacuum pump is mounted in at least one tubular region of one or both carrier poles.
Inventors
- 👤 Asmund S Laerdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61G; A61G1/00; A61G1/04; A61G7/00; A61G7/05; A61G7/057; A61G7/05738; A61G7/05753; Y; Y10; Y10S; Y10S5/00; Y10S5/911; Y10S5/913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A stretcher comprising: a. two carrier poles, at least one of said poles having a tubular portion; b. an air impermeable mattress cover supported by said poles and having an interiOr zone; c. a granular material in said interior zone of said mattress cover; and d. a vacuum pump means in said tubular portion of said pole in gaseous communication with said interior zone of said mattress cover for reducing the pressure therein thereby permitting compression of said granular material within said mattress.
Claim 2
Dependent Claim
83 words
A stretcher comprising: a. two carrier poles, at least one of said poles having a tubular portion; b. an air impermeable mattress cover supported by said poles and having an interiOr zone; c. a granular material in said interior zone of said mattress cover; and d. a vacuum pump means in said tubular portion of said pole in gaseous communication with said interior zone of said mattress cover for reducing the pressure therein thereby permitting compression of said granular material within said mattress.
Claim 3
Dependent Claim
19 words
A stretcher as claimed in claim 1, wherein said pump includes a piston, axially reciprocable within said tubular portion.
Claim 4
Dependent Claim
25 words
A stretcher as claimed in claim 2, and further comprising an operating handle connected to said piston and projecting axially from the associated carrier pole.
Claim 5
Dependent Claim
27 words
A stretcher as claimed in claim 2, wherein said piston cooperates with the interior of the tubular portion, whereby said tubular portion itself acts as a cylinder.
Claim 6
Dependent Claim
27 words
A stretcher according to claim 4, and further comprising a lip seal carried by said piston and engaging said tubular portion effective to act as a valve.
Claim 7
Dependent Claim
45 words
A stretcher according to claim 2 and further comprising a hollow piston rod connected to said piston and defining, with said tubular portion, an annular space therebetween, and means defining an aperture in said piston rod communicating the hollow interior thereof with said annular space.
Claim 8
Dependent Claim
30 words
A stretcher according to claim 6, and further comprising a removable end cap to said hollow piston rod, whereby the hollow interior thereof may be used as a storage space.
Claim 9
Dependent Claim
17 words
A stretcher according to claim 1, wherein said mattress cover further comprises at least one non-return valve.
Claim 10
Dependent Claim
22 words
A stretcher according to claim 1, wherein said vacuum pump is operatively connected to said mattress cover by means of a hose.
Claim 11
Dependent Claim
35 words
A stretcher according to claim 1, wherein the carrier poles are each formed as at least two parts which are selectively mutually longitudinally displaceable, said vacuum pump being in an end one of said parts.
References Cited (Backward Citations)
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |