Patent US3486834A successfully refreshed from Google Patents.
US3486834A
Expired / Lapsed
US
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Gas burning system arrangement
Assignee: Combustion Engineering Inc
•
Filing: 1968-04-25
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Granted: 1969-12-30
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Expires: 1988-04-25
Abstract
No abstract record available.
Inventors
- 👤 Donald J Frey
- 👤 Rudolph F Roerden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:53
CPC Classifications
F; F23; F23D; F23D14/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2531316A
Cited
US2480547A
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US3109481A
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US3164200A
Cited
US3284008A
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US3294146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |