Patent US3905228A successfully refreshed from Google Patents.
US3905228A
Expired / Lapsed
US
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Mechanical heat flux recorder
Assignee: United States Department of the Navy
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Filing: 1974-06-20
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Granted: 1975-09-16
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Expires: 1994-06-20
Abstract
Abstract A mechanical heat flux recorder is provided which is based upon the shape recovery properties of a nickel-titanium alloy (NiTi). A pair of nickel-titanium strips are connected between a heat sink block enclosed in an asbestos lined metal box and respective exposed heat receivers. The heat receivers have calibration marks scribed around the edges and reference marks are provided on the box. The heat receivers are first turned not more than one revolution clockwise, for example, and set at an initial position indicating zero. This twisting operation plastically deforms the nickel-titanium metal strips. When the instrument is then exposed to a heat environment which is being investigated, the strips partially recover their original straight shape, and the dial readings after exposure are noted in conjunction with a prepared chart to find the heat flux in calories per centimeter squared per second or some other preferred units of measure. The instrument may then be re-set and re-used.
Inventors
- 👤 Warren K Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:59
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04; G01K17/00; G01K5/00; G01K5/48; G01K5/483
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A pyrometric device comprising: a heat sink in the form of a solid metal block; at least two heat receiver means each in the form of a flat disc; said heat receiver means each being connected to said heat sink by a strip of material which may be deformed from an original shape to a deformed shape and retained at said deformed shape at ordinary temperatures but which will return to the original shape when subjected to a predetermined transformation temperature; and a container of insulative material covering all of the components except for faces of said heat receiver means remote from said heat sink so that said strips are progressively heated from said heat receiving means toward said heat sink and are thus induced to return toward said original shape in proportion to the heat encountered by said receiver means.
Claim 2
Dependent Claim
141 words
A pyrometric device comprising: a heat sink in the form of a solid metal block; at least two heat receiver means each in the form of a flat disc; said heat receiver means each being connected to said heat sink by a strip of material which may be deformed from an original shape to a deformed shape and retained at said deformed shape at ordinary temperatures but which will return to the original shape when subjected to a predetermined transformation temperature; and a container of insulative material covering all of the components except for faces of said heat receiver means remote from said heat sink so that said strips are progressively heated from said heat receiving means toward said heat sink and are thus induced to return toward said original shape in proportion to the heat encountered by said receiver means.
Claim 3
Dependent Claim
22 words
The device of claim 1 comprising two heat receivers of fully hardened spring steel and said heat receivers being of differing thicknesses.
Claim 4
Dependent Claim
25 words
The device of claim 2: wherein said strips are a nickel-titanium alloy consisting of 55% by weight of nickel and 45% by weight of titanium.
Claim 5
Dependent Claim
18 words
The device of claim 2; wherein said strip of material consists of an alloy of nickel and titanium.
Claim 6
Dependent Claim
18 words
The device of claim 1; wherein said strip of material consists of an alloY of nickel and titanium.
Claim 7
Dependent Claim
23 words
The device of claim 5: wherein said strip of material is an alloy of 55 weight percent nickel and 45 weight percent titanium.
Claim 8
Dependent Claim
81 words
A pyrometric device comprising: a heat sink in the form of a solid metal block; at least one heat receiver spaced from said heat sink; said heat receiver being of fully hardened spring steel; a strip of NiTi alloy fastened to said heat sink and said heat receiver; said strip being deformable from an original shape to a deformed shape and retaining said deformed shape at room temperatures but returning to the original shape when subjected to a predetermined transformation temperature.
Claim 9
Dependent Claim
81 words
A pyrometric device comprising: a heat sink in the form of a solid metal block; at least one heat receiver spaced from said heat sink; said heat receiver being of fully hardened spring steel; a strip of NiTi alloy fastened to said heat sink and said heat receiver; said strip being deformable from an original shape to a deformed shape and retaining said deformed shape at room temperatures but returning to the original shape when subjected to a predetermined transformation temperature.
References Cited (Backward Citations)
US3526865A
Cited
US3712131A
Cited
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 |