US2843504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate coating of incandescent lamp
Assignee: US Philips Corp
•
Filing: 1955-02-14
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Granted: 1958-07-15
•
Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Henricus Antonius Van Bakel
- 👤 Gast Theodorus Adrianus Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:36
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; H; H01; H01K; H01K3/00; H01K3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS OF COATING THE INNER SIDE OF AN ENVELOPE OF AN INCANDESCENT LAMP WITH A LIGHT DIFFUSING LAYER WHICH COMPRISES THE STEPS, PREPARING A STABLE SUSPENSION OF A WATER-INSOLUBLE ALKALINE EARTH PHOSPHATE IN A MIXTURE OF WATER, A WATER-MISCIBLE VOLATILE ORGANIC LIQUID AND AT LEAST 1.5% BASED ON THE WEIGHT OF PHOSPHATE OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND ACIDS THAT LIBERATE PHOSPHORIC ACID FROM THE PHOSPHATE, APPLYING A LAYER OF THE SUSPENSION TO THE INNER SURFACE OF THE ENVELOPE, REMOVING EXCESS SUSPENSION FROM THE ENVELOPE, DRYING THE RESIDUAL LAYER AND FINALLY HEATING THE DRIED LAYER TO A TEMPERATURE OF AT LEAST 200*C.
Claim 2
Dependent Claim
109 words
A PROCESS OF COATING THE INNER SIDE OF AN ENVELOPE OF AN INCANDESCENT LAMP WITH A LIGHT DIFFUSING LAYER WHICH COMPRISES THE STEPS, PREPARING A STABLE SUSPENSION OF A WATER-INSOLUBLE ALKALINE EARTH PHOSPHATE IN A MIXTURE OF WATER, A WATER-MISCIBLE VOLATILE ORGANIC LIQUID AND AT LEAST 1.5% BASED ON THE WEIGHT OF PHOSPHATE OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND ACIDS THAT LIBERATE PHOSPHORIC ACID FROM THE PHOSPHATE, APPLYING A LAYER OF THE SUSPENSION TO THE INNER SURFACE OF THE ENVELOPE, REMOVING EXCESS SUSPENSION FROM THE ENVELOPE, DRYING THE RESIDUAL LAYER AND FINALLY HEATING THE DRIED LAYER TO A TEMPERATURE OF AT LEAST 200*C.
References Cited (Backward Citations)
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US2706691A
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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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |