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Patent US2803775A successfully refreshed from Google Patents.
US2803775A
Expired / Lapsed
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Vapour discharge lamp
Assignee: WC Heraus GmbH and Co KG
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Filing: 1955-05-20
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Granted: 1957-08-20
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Expires: 1975-05-20
Abstract
No abstract record available.
Inventors
- 👤 Jaumann Johannes
- 👤 Ruthardt Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:26
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN A VAPOUR DISCHARGE LAMP COMPRISING A DISCHARGE ENVELOPE CONTAINING SPACED ELECTRODES, A FILLING MATERIAL SELECTED FROM THE GROUP CONSISTING OF OXIDES AND HALIDES OF METALS OF THE 6TH TO 8TH GROUP OF THE PERIODIC TABLE, SAID FILLING MATERIAL BEING CONTAINED IN SAID ENVELOPE IN AN AMOUNT SUFFICIENT TO PROVIDE A VAPOUR PRESSURE ABOVE 50
Claim 2
Dependent Claim
55 words
IN A VAPOUR DISCHARGE LAMP COMPRISING A DISCHARGE ENVELOPE CONTAINING SPACED ELECTRODES, A FILLING MATERIAL SELECTED FROM THE GROUP CONSISTING OF OXIDES AND HALIDES OF METALS OF THE 6TH TO 8TH GROUP OF THE PERIODIC TABLE, SAID FILLING MATERIAL BEING CONTAINED IN SAID ENVELOPE IN AN AMOUNT SUFFICIENT TO PROVIDE A VAPOUR PRESSURE ABOVE 50
References Cited (Backward Citations)
US2697183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |