US2921827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing incandescent lamps
Assignee: Westinghouse Electric Corp
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Filing: 1957-09-30
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Granted: 1960-01-19
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Meister George
- 👤 Nicholas F Cerulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:18
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS OF APPLYING FINELY-DIVIDED, POROUS, GENERALLY-AMORPHOUS SILICA TO AN INCANDESCENT LAMP ENVELOPE HAVING AN OPEN NECK, COMPRISING EVENLY APPLYING SAID SILICA TO THE INTERIOR SURFACE OF SAID ENVELOPE, LIMITING THE TEMPERATURES TO WHICH SAID SILICA IS SUBJECTED BEFORE, DURING, AND AFTER COATING TO NOT MORE THAN 625* C., LEHRING SAID SILICA-COATED ENVELOPE SO THAT AT NORMALOPERATION MINIMUM LAMP ENVELOPE TEMPERATURES SAID SILICA COATING WILL CONSTITUTE A GETTER FOR AT LEAST 0.4% BY WEIGHT OF ADDITIONAL MOISTURE, AND HERMETICALLY SEALING A MOUNT TO SAID NECK AND TIPPING-OFF WHILE MAINTAINING SAID SILICA COATING WITHIN THE AFORESTATED MOISTURE GETTERING CONDITION.
Claim 2
Dependent Claim
98 words
THE PROCESS OF APPLYING FINELY-DIVIDED, POROUS, GENERALLY-AMORPHOUS SILICA TO AN INCANDESCENT LAMP ENVELOPE HAVING AN OPEN NECK, COMPRISING EVENLY APPLYING SAID SILICA TO THE INTERIOR SURFACE OF SAID ENVELOPE, LIMITING THE TEMPERATURES TO WHICH SAID SILICA IS SUBJECTED BEFORE, DURING, AND AFTER COATING TO NOT MORE THAN 625* C., LEHRING SAID SILICA-COATED ENVELOPE SO THAT AT NORMALOPERATION MINIMUM LAMP ENVELOPE TEMPERATURES SAID SILICA COATING WILL CONSTITUTE A GETTER FOR AT LEAST 0.4% BY WEIGHT OF ADDITIONAL MOISTURE, AND HERMETICALLY SEALING A MOUNT TO SAID NECK AND TIPPING-OFF WHILE MAINTAINING SAID SILICA COATING WITHIN THE AFORESTATED MOISTURE GETTERING CONDITION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |