US3225244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium-vapour discharge lamp
Assignee: US Philips Corp
•
Filing: 1961-01-06
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Granted: 1965-12-21
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Expires: 1981-01-06
Abstract
No abstract record available.
Inventors
- 👤 Martinus Henricus Adrianu Weij
- 👤 Spiessens Raymond Francois
- 👤 Grouw Coenraad Maria La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:29
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18; H01J61/22; H01J61/30; H01J61/302; H01J61/70; H01J61/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A SODIUM VAPOR DISCHARGE DEVICE ADAPTED TO OPERATE WITH A POSITIVE COLUMN DISCHARGE COMPRISING AN ENVELOPE, A PAIR OF ELECTRODES WITHIN SAID ENVELOPE AND A MIXTURE OF A RARE GAS AND SODIUM WITHIN THE ENVELOPE FOR MAINTAINING A DISCHARGE BETWEEN THE ELECTRODES, SAID RARE GAS HAVING A PRESSURE OF ABOUT 1 TO 8 MMS. OF HG AT ROOM TEMPERATURE AND SAID ENVELOPE HAVING DIMENSIONS AND THERMAL CHACTERISTICS WHERBYWITH A POTENTIAL APPLIED BETWEEN SAID ELECTRODES A POSITIVE COLUMN IS PRODUCED HAVING A VOLTAGE GRADIENT OF ABOUT 0.25 TO 2.5 VOLTS PER CM.
Claim 2
Dependent Claim
91 words
A SODIUM VAPOR DISCHARGE DEVICE ADAPTED TO OPERATE WITH A POSITIVE COLUMN DISCHARGE COMPRISING AN ENVELOPE, A PAIR OF ELECTRODES WITHIN SAID ENVELOPE AND A MIXTURE OF A RARE GAS AND SODIUM WITHIN THE ENVELOPE FOR MAINTAINING A DISCHARGE BETWEEN THE ELECTRODES, SAID RARE GAS HAVING A PRESSURE OF ABOUT 1 TO 8 MMS. OF HG AT ROOM TEMPERATURE AND SAID ENVELOPE HAVING DIMENSIONS AND THERMAL CHACTERISTICS WHERBYWITH A POTENTIAL APPLIED BETWEEN SAID ELECTRODES A POSITIVE COLUMN IS PRODUCED HAVING A VOLTAGE GRADIENT OF ABOUT 0.25 TO 2.5 VOLTS PER CM.
References Cited (Backward Citations)
US2030390A
Cited
US2238777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |