US3619463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating furnace
Assignee: E ELECTRICITE COMP GEN
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Filing: 1970-12-20
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Granted: 1971-11-09
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Expires: 1990-12-20
Abstract
Abstract The coefficient of expansion and the thermal coefficient of the optical index in solids is measured by an interferential method employing a heating furnace consisting of two half-molds including heating elements. The half-molds are coupled together by elastic means acting perpendicularly to the axis of the halfmolds which form a cylindrical housing open at both its ends.
Inventors
- 👤 Jean-Pierre Budin
- 👤 Jean Raffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:37
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
In a heating furnace supporting a specimen defining a FABRY and PEROT cavity and comprising two semicylindrical shells provided with heating elements and coupled together by resilient means acting substantially orthogonally to the axis of symmetry of the shells, the improvement comprising: aligned V-shaped recesses within the center of the opposed interior walls of said shell defining a gap in the form of a rectangular parallelepiped having a square cross section, said semicylindrical shells being oppositely disposed along the diagonal plane of the square cross section of the parallelepiped and said specimen being disposed within said shell gap and in intimate contact with the shell walls.
Claim 2
Dependent Claim
106 words
In a heating furnace supporting a specimen defining a FABRY and PEROT cavity and comprising two semicylindrical shells provided with heating elements and coupled together by resilient means acting substantially orthogonally to the axis of symmetry of the shells, the improvement comprising: aligned V-shaped recesses within the center of the opposed interior walls of said shell defining a gap in the form of a rectangular parallelepiped having a square cross section, said semicylindrical shells being oppositely disposed along the diagonal plane of the square cross section of the parallelepiped and said specimen being disposed within said shell gap and in intimate contact with the shell walls.
Claim 3
Dependent Claim
17 words
The furnace according to claim 1, further comprising means for positively locating said half-shells opposite one another.
Claim 4
Dependent Claim
34 words
The furnace according to claim 2, wherein said locating means consist of a tenon formed on one face of the two half-shells and a cooperating recess within the opposed face of the other half-shell.
Claim 5
Dependent Claim
16 words
The furnace according to claim 1, wherein the said half-shells are surrounded by a solid member.
References Cited (Backward Citations)
US3377912A
Cited
US3406275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |