US3388931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Foster Wheeler Inc
•
Filing: 1967-03-31
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Granted: 1968-06-18
•
Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 Richard C Johnson
- 👤 Kraje Milton Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:39
CPC Classifications
F; F16; F16L; F16L5/00; F16L5/02; F16L41/00; F16L41/001; F28; F28F; F28F9/00; F28F9/02; F28F9/04; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1735563A
Cited
US2447259A
Cited
US2938238A
Cited
FR1159921A
Cited
DE1172418B
Cited
GB978098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |