Patent US3636352A successfully refreshed from Google Patents.
US3636352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strontium pyrophosphate as adhesive in luminescent screens
Assignee: US Philips Corp
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Filing: 1969-12-02
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Granted: 1972-01-18
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Expires: 1989-12-02
Abstract
Abstract The invention relates to a luminescent screen including a luminescent calcium halophosphate phosphor using a strontium pyrophosphate adhesive layer provided on a transparent support. Furthermore the invention relates to a gas discharge lamp provided with such a luminescent screen.
Inventors
- 👤 Willem Lambertus Wanmaker
- 👤 Marinus Gerardus Antoine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:06
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/08; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
The luminescent screen of claim 1 wherein 0.1-0.75 percent by weight of the strontium pyrophosphate is employed.
Claim 2
Dependent Claim
57 words
A gas discharge lamp provided with a luminescent screen on a transparent support, said screen comprising calcium halophosphate phosphor particles mixed with finely divided particles of strontium pyrophosphate as an adhesive in an amount of 0.1-0.75 percent by weight of the phosphor particles, wherein the mean particle size of the strontium pyrophosphate is smaller than 1 micron.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |