US3480469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air knife and vacuum doctoring
Assignee: Bethlehem Steel Corp
•
Filing: 1967-01-19
•
Granted: 1969-11-25
•
Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 Robert S Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:23
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/14; C23C2/16; C23C2/18; C23C2/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1140873A
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US1337619A
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US1385042A
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US1493246A
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US1772907A
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US2450669A
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US2833672A
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US2899339A
Cited
US3264673A
Cited
US3369522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |