US4412126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared source
Assignee: Lockheed Martin Corp
•
Filing: 1982-02-04
•
Granted: 1983-10-25
•
Expires: 2002-02-04
Abstract
Abstract An infrared source comprising an electrically powered, hollow cylindrical rod which operates at lower temperatures and yet has no decrease in output power is configured by increasing the outside diameter of the rod and inserting grooves therein which provide cavities increasing the apparent surface emissivity of the rod.
Inventors
- 👤 Richard J. Brockway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:56
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
In an infrared source including a hollow cylindrical integral rod of a material which when heated by passing an electrical current along its length will emit thermal energy by radiation and having a requirement for constant rod length and voltage, means for decreasing the operating temperature of the rod, comprising: a replacement graphite rod having an increased outside diameter and irregular surface, to decrease cross-sectional areas, to maintain substantially constant resistance and greater emissivity at lower operating temperatures, said irregular surface comprising macroscopic sawtooth grooves.
Claim 2
Dependent Claim
85 words
In an infrared source including a hollow cylindrical integral rod of a material which when heated by passing an electrical current along its length will emit thermal energy by radiation and having a requirement for constant rod length and voltage, means for decreasing the operating temperature of the rod, comprising: a replacement graphite rod having an increased outside diameter and irregular surface, to decrease cross-sectional areas, to maintain substantially constant resistance and greater emissivity at lower operating temperatures, said irregular surface comprising macroscopic sawtooth grooves.
References Cited (Backward Citations)
US573558A
Cited
US1319002A
Cited
US686245A
Cited
US859255A
Cited
US853678A
Cited
US974389A
Cited
US944139A
Cited
US1033205A
Cited
US1729673A
Cited
US2152934A
Cited
US2653800A
Cited
FR1069881A
Cited
US3002729A
Cited
US3089940A
Cited
US3205343A
Cited
US3217973A
Cited
US3327093A
Cited
US3554830A
Cited
US3419709A
Cited
US3541225A
Cited
US3519255A
Cited
US3727682A
Cited
US3943218A
Cited
US4144473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |