US3515853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus
Assignee: Boeing North American Inc
•
Filing: 1967-09-15
•
Granted: 1970-06-02
•
Expires: 1987-09-15
Abstract
No abstract record available.
Inventors
- 👤 Charles O Mcadams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:26
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; H; H05; H05B; H05B3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1638353A
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US1971387A
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US2426976A
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US2633522A
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US2611848A
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US2965868A
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US3139745A
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US3161759A
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US3283127A
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US3353005A
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US3396455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |