Patent US3841920A successfully refreshed from Google Patents.
US3841920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an infrared radiation source
Assignee: Oerlikon Management USA Inc
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Filing: 1973-01-02
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Granted: 1974-10-15
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Expires: 1993-01-02
Abstract
Abstract An infrared radiation source comprising a nickel-chromium alloy wire having an oxidized surface and being helically coiled around a stainless steel threaded core which functions as a heat ballast. The source is manufactured by wrapping the wire around the core in a threaded groove to form a helical coil with separated turns; unscrewing the core from the coil; forming an oxide coating on the wire by holding the coil in an oxidizing environment and heating the coil by passing electric current through the wire; and, while forming an oxide coating on the wire, screwing the core onto the coil until all the turns thereof are engaged around the core.
Inventors
- 👤 J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:23
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; H05B3/0033; H05B3/009
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
THE METHOD OF MANUFACTURING AN INFRARED RADIATION SOURCE COMPRISING: COILING A WIRE OF RELATIVELY HIGH ELECTRICAL RESISTANCE AROUND A THREADED METAL CORE HAVING A RELATIVELY HIGH CORROSION RESISTANCE TO FORM A COIL HAVING A MULTIPLICITY OF TURNS ENGAGED IN THE THREADED GROOVE OF SAID CORE AND SEPARATED FROM ADJACENT TURNS; ROTATING SAID CORE RELATIVE TO SAID COIL TO AT LEAST PARTIALLY WITHDRAW SAID CORE FROM SAID COIL AND DISENGAGE TURNS THEREOF FROM SAID CORE; CONCURRENTLY HEATING SAID CORE AND SAID COIL IN AN OXIDIZING ENVIRONMENT, AND WHILE SAID COIL IS BEING OXIDIZED, ROTATING SAID CORE RELATIVE TO SAID COIL TO PROGRESSIVELY ENGAGE ALL OF THE TURNS THEREOF WITH SAID THREADED GROOVE.
Claim 2
Independent Claim
111 words
THE METHOD OF MANUFACTURING AN INFRARED RADIATION SOURCE COMPRISING: COILING A WIRE OF RELATIVELY HIGH ELECTRICAL RESISTANCE AROUND A THREADED METAL CORE HAVING A RELATIVELY HIGH CORROSION RESISTANCE TO FORM A COIL HAVING A MULTIPLICITY OF TURNS ENGAGED IN THE THREADED GROOVE OF SAID CORE AND SEPARATED FROM ADJACENT TURNS; ROTATING SAID CORE RELATIVE TO SAID COIL TO AT LEAST PARTIALLY WITHDRAW SAID CORE FROM SAID COIL AND DISENGAGE TURNS THEREOF FROM SAID CORE; CONCURRENTLY HEATING SAID CORE AND SAID COIL IN AN OXIDIZING ENVIRONMENT, AND WHILE SAID COIL IS BEING OXIDIZED, ROTATING SAID CORE RELATIVE TO SAID COIL TO PROGRESSIVELY ENGAGE ALL OF THE TURNS THEREOF WITH SAID THREADED GROOVE.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said core is withdrawn completely from said coil prior to first heating said coil in an oxidizing environment to form an oxide coating thereon.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said coil is heated by passing electric current through said wire.
Claim 5
Dependent Claim
39 words
The method of claim 3 wherein core is rotated relative to said coil to advance said core into said coil to heat said coil and form an oxide coating thereon while electric current is being passed through said wire.
Claim 6
Dependent Claim
30 words
The method of claim 4 wherein core is formed of a chromium alloy steel having high corrosion resistance and said wire is a nickel-chromium alloy having relatively high electrical resistance.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |