US3429563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treating quench furnace
Assignee: Richard D Brew and Co Inc
•
Filing: 1967-10-12
•
Granted: 1969-02-25
•
Expires: 1987-10-12
Abstract
No abstract record available.
Inventors
- 👤 Ingar F Andersen
- 👤 Richard D Brew
- 👤 John J Duggan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/63; C21D1/74; C21D1/773
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3266644A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |