US3452933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil fuel burning equipment
Assignee: National Research Development Corp UK
•
Filing: 1967-04-27
•
Granted: 1969-07-01
•
Expires: 1987-04-27
Abstract
No abstract record available.
Inventors
- 👤 John Philip Dabbs Hakluytt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:38
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/10; F23D11/101; F23D11/104
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB147891A
Cited
US1578101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |