Patent US2246324A successfully refreshed from Google Patents.
Patent US3958565A successfully refreshed from Google Patents.
US3958565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilatory capacity measuring instrument
Assignee: National Research Development Corp UK
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Filing: 1974-07-12
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Granted: 1976-05-25
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Expires: 1994-07-12
Abstract
Abstract A human ventilatory capacity measurement instrument, of the kind which measures the peak flow rate of a single forced expiration, comprises a hollow cylindrical body housing a coaxial rod on which is carried a piston spring-biased in one longitudinal sense. The body is longitudinally slotted and has an indicator engaged in the slot for movement therealong by the piston when blown against its spring bias, but the indicator is returned to its starting position in the slot by independent movement. A scale is provided alongside the slot to give a measure of peak flow rate by the final rest position of the indicator when pushed by the piston.
Inventors
- 👤 Basil Martin Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/087; A61B5/0871
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
A ventilatory capacity measuring instrument for measuring the maximum flow rate of a single forced expiration, comprising: a hollow cylindrical body; first and second apertured end members connected in respective ends of said body, with at least one of said members being separable from said body; a hollowed mouthpiece connected with said first end member to extend outwardly therefrom relative to said body, and communicated with the hollow of said body by way of the aperturing of said first end member; a rod respectively connected at its ends with said end members extending coaxially within said body; an annular piston slidably mounted on said rod and wholly confined within said body; a constant rate spring operably connected between said piston and body, in the annular space between said body and rod, to apply a linearly increasing bias against movement of said piston from said first end member towards said second end member; a slot of uniform width formed in and extending along said body in a longitudinal direction; an indicator mounted in said slot between said piston and said second end member, and separably engaged with said piston for movement therewith towards said second end member but separate movement towards said first end member, said indicator including spring retaining means for engaging the parts of said body bordering said slot; and a non-linear scale extending along said body alongside said slot.
Claim 2
Dependent Claim
231 words
A ventilatory capacity measuring instrument for measuring the maximum flow rate of a single forced expiration, comprising: a hollow cylindrical body; first and second apertured end members connected in respective ends of said body, with at least one of said members being separable from said body; a hollowed mouthpiece connected with said first end member to extend outwardly therefrom relative to said body, and communicated with the hollow of said body by way of the aperturing of said first end member; a rod respectively connected at its ends with said end members extending coaxially within said body; an annular piston slidably mounted on said rod and wholly confined within said body; a constant rate spring operably connected between said piston and body, in the annular space between said body and rod, to apply a linearly increasing bias against movement of said piston from said first end member towards said second end member; a slot of uniform width formed in and extending along said body in a longitudinal direction; an indicator mounted in said slot between said piston and said second end member, and separably engaged with said piston for movement therewith towards said second end member but separate movement towards said first end member, said indicator including spring retaining means for engaging the parts of said body bordering said slot; and a non-linear scale extending along said body alongside said slot.
Claim 3
Dependent Claim
105 words
An instrument as in claim 1 wherein said indicator is of integral elongated construction comprising a first widened end portion seated on the exterior surface of said body to laterally bridge said slot, a narrowed central portion connected at one end to said first portion and extending through said slot into said body, and a second widened end portion connected with the other end of said central portion and seated on the interior surface of said body to bridge said slot, said construction extending in a spiral configuration in a longitudinal axial planar direction of said body with said spiral configuration opening towards said piston.
Claim 4
Dependent Claim
34 words
An instrument as in claim 2 wherein said body is formed with a longitudinally-extending groove in its exterior surface, said slot is sited in said groove, and said indicator is seated in said groove.
References Cited (Backward Citations)
US471389A
Cited
US1541750A
Cited
GB267933A
Cited
US3298362A
Cited
GB1160669A
Cited
US3635214A
Cited
US3720202A
Cited
US3862628A
Cited
US3826247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |