Patent US3665750A successfully refreshed from Google Patents.
US3665750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burn rate testing apparatus
Assignee: National Aeronautics and Space Administration
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Filing: 1969-08-28
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Granted: 1972-05-30
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Expires: 1989-08-28
Abstract
Abstract An apparatus for testing the burn rate between two spaced apart points on a sample of material. It includes an angularly adjustable support holder, an electrically ignited torch supplied with an independent supply of oxygen, a flame shutter between the torch and the sample holder and photocells positioned to sense ignition of the test material and the rate of burn between two spaced apart points on the material.
Inventors
- 👤 Frederick S Dawn
- 👤 William L Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:35
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
In a burn rate testing apparatus adapted for operation in an enclosed environmental chamber, the combination comprising: a material sample holder; gas burner means; independent means for supplying oxygen and fuel gas to said gas burner means in essentially stoichiometric proportions to prevent altering the proportions of environmental constituents in the enclosed chamber; means for controlling and monitoring the atmosphere in the enclosed chamber to maintain integrity thereof; means for igniting said burner; and means for sensing the rate of burning of said sample material between two laterally spaced apart points on said material.
Claim 2
Dependent Claim
94 words
In a burn rate testing apparatus adapted for operation in an enclosed environmental chamber, the combination comprising: a material sample holder; gas burner means; independent means for supplying oxygen and fuel gas to said gas burner means in essentially stoichiometric proportions to prevent altering the proportions of environmental constituents in the enclosed chamber; means for controlling and monitoring the atmosphere in the enclosed chamber to maintain integrity thereof; means for igniting said burner; and means for sensing the rate of burning of said sample material between two laterally spaced apart points on said material.
Claim 3
Dependent Claim
30 words
The invention as claimed in claim 1 including: a remotely operated flame shutter removably supported between the flame of said burner and the sample material held by said sample holder.
Claim 4
Dependent Claim
25 words
The invention as claimed in claim 1 including: means for remotely adjusting the angle of said sample holder relative to the flame of said burner.
Claim 5
Dependent Claim
14 words
The invention as claimed in claim 1 including: means for electrically igniting said burner.
Claim 6
Dependent Claim
40 words
The invention as claimed in claim 1 wherein: said means for sensing the rate of burning of said sample material includes a plurality of spaced apart photocells positioned to sense the burning of that portion of said material adjacent thereto.
Claim 7
Dependent Claim
20 words
The invention as claimed in claim 5 including: another photocell positioned to sense impingement of flame on said material sample.
Claim 8
Dependent Claim
29 words
The invention as claimed in claim 5 including: recording means for recording the interval of time elapsed between electrical signals generated by at least any two of said photocells.
Claim 9
Dependent Claim
23 words
The invention as claimed in claim 1 wherein: said means for controlling environment include means for varying the pressure level of said environment.
Claim 10
Dependent Claim
25 words
The invention as claimed in claim 1 wherein: said means for controlling environment include means for supplying at least one inert gas to said environment.
Claim 11
Dependent Claim
73 words
The invention as claimed in claim 1 including: means for sensing impingement of flame on said material sample; and wherein said burner and said means for sensing impingement of flame are positioned adjacent said material sample holder at one face thereof, and said means for sensing the rate of burn is positioned adjacent said material sample holder at the opposite face thereof, such that rate of burn-through of material may also be determined.
Claim 12
Dependent Claim
62 words
The invention as claimed in claim 1 wherein said means for igniting said burner includes: signal responsive value means for selectively permitting passage of gas to said gas burner; electrode igniters positioned adjacent said burner; and signal generating sensor means for oPening said signal responsive valve means upon sensing activation of said electrode igniters, thus permitting passage of gas to said burner.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |