US2740035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating device
Assignee: Zephyr Manufacturing Co Inc
•
Filing: 1953-07-06
•
Granted: 1956-03-27
•
Expires: 1973-07-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Roy Van Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:50
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1418496A
Cited
US2022662A
Cited
US2452214A
Cited
US2456142A
Cited
US2477341A
Cited
US2545653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |