Patent US4553577A successfully refreshed from Google Patents.
US2806444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica coating apparatus for incandescent lamp bulbs
Assignee: Westinghouse Electric Corp
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Filing: 1954-12-16
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Granted: 1957-09-17
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Expires: 1974-12-16
Abstract
No abstract record available.
Inventors
- 👤 Leo C Werner
- 👤 Stanley A Lopenski
- 👤 Nicholas J Rainone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:26
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
AN IMPROVED SILICA COATING APPARATUS FOR INCANDESCENT LAMP BULBS COMPRISING A FRAME, A SILICA POWDER RESERVOIR ON SAID FRAME, AN EXPANSION CHAMBER MOUNTED ON SAID RESERVOIR, MEANS ON SAID EXPANSION CHAMBER FOR SEPARATING SAID EXPANSION CHAMBER FORM SAID RESERVOIR, AN ASPIRATOR NEAR SAID RESERVOIR FOR DELIVERING SILICA SMOKE
Claim 2
Dependent Claim
48 words
AN IMPROVED SILICA COATING APPARATUS FOR INCANDESCENT LAMP BULBS COMPRISING A FRAME, A SILICA POWDER RESERVOIR ON SAID FRAME, AN EXPANSION CHAMBER MOUNTED ON SAID RESERVOIR, MEANS ON SAID EXPANSION CHAMBER FOR SEPARATING SAID EXPANSION CHAMBER FORM SAID RESERVOIR, AN ASPIRATOR NEAR SAID RESERVOIR FOR DELIVERING SILICA SMOKE
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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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |