US3488829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plugging of defective tubes in tube bundles
Assignee: Foster Wheeler Inc
•
Filing: 1967-11-28
•
Granted: 1970-01-13
•
Expires: 1987-11-28
Abstract
No abstract record available.
Inventors
- 👤 Colin Ernest Boniface
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:20
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/08; F16L41/082; F16L41/084; F28; F28F; F28F11/00; F28F11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2394831A
Cited
US3247591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |