US2816406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp
Assignee: Westinghouse Electric Corp
•
Filing: 1956-05-17
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Granted: 1957-12-17
•
Expires: 1976-05-17
Abstract
No abstract record available.
Inventors
- 👤 Henry J Eppig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:56
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395; F; F21; F21K; F21K5/00; F21K5/02; Y; Y10; Y10S; Y10S53/00; Y10S53/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF PRESSURE FILLING WITH OXYGEN A RADIATION-TRANSMITTING PHOTOFLASH LAMP ENVELOPE, COMPRISING INSERTING INTO SAID ENVELOPE AN ACTINIC MATERIAL IN A PREDETERMINED AMOUNT AND A MINERAL CONTAINING OXYGEN IN CHEMICALLY-COMBINED FROM WHICH IS RELEASABLE IN FREE FORM, FILLING SAID ENVELOPE WITH OXYGEN GAS TO A PRESSURE SOMEWHAT LESS THAN ATMOSPHERIC, HERMETICALLY SEALING SAID ENVELOPE, AND CAUSING THE OXYGEN-CONTAINING MATERIAL IN SAID ENVELOPE TO RELEASE AT LEAST PART OF ITS CHEMICALLYCOMBINED OXYGEN AS OXYGEN GAS TO INCREASE THE OXYGEN FILL PRESSURE WITHIN SAID ENVELOPE TO GREATER THAN ATMOSPHERIC.
Claim 2
Independent Claim
88 words
THE METHOD OF PRESSURE FILLING WITH OXYGEN A RADIATION-TRANSMITTING PHOTOFLASH LAMP ENVELOPE, COMPRISING INSERTING INTO SAID ENVELOPE AN ACTINIC MATERIAL IN A PREDETERMINED AMOUNT AND A MINERAL CONTAINING OXYGEN IN CHEMICALLY-COMBINED FROM WHICH IS RELEASABLE IN FREE FORM, FILLING SAID ENVELOPE WITH OXYGEN GAS TO A PRESSURE SOMEWHAT LESS THAN ATMOSPHERIC, HERMETICALLY SEALING SAID ENVELOPE, AND CAUSING THE OXYGEN-CONTAINING MATERIAL IN SAID ENVELOPE TO RELEASE AT LEAST PART OF ITS CHEMICALLYCOMBINED OXYGEN AS OXYGEN GAS TO INCREASE THE OXYGEN FILL PRESSURE WITHIN SAID ENVELOPE TO GREATER THAN ATMOSPHERIC.
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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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |