US3549439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical lapping method
Assignee: Boeing North American Inc
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Filing: 1967-09-15
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Granted: 1970-12-22
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Expires: 1987-09-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick S Kaveggia
- 👤 David E O'grady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:22
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B24; B24B; B24B37/00; B24B37/04; C03; C03C; C03C15/00; C03C15/02; C04B41/53; C04B41/5338; C04B41/5353; C04B41/80; C04B41/91; C23; C23F; C23F1/00
Claims Analysis
Total Claims: 0
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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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |