US3375628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated wall construction for heated surfaces
Assignee: Foster Wheeler Inc
•
Filing: 1965-07-01
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Granted: 1968-04-02
•
Expires: 1985-07-01
Abstract
No abstract record available.
Inventors
- 👤 John M Connell
- 👤 Richard C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:06
CPC Classifications
F; F16; F16L; F16L59/00; F23; F23M; F23M5/00; F23M5/08
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |