Patent US3544277A successfully refreshed from Google Patents.
US3544277A
Expired / Lapsed
US
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Dual heat zone pyrolytic furnace
Assignee: Boeing North American Inc
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Filing: 1968-09-16
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Granted: 1970-12-01
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Ihor Lysyi
- 👤 Lawrence H Groeper
- 👤 Kurt H Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/12; F; F27; F27D; F27D11/00; F27D11/02; G01N31/00; G01N31/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3232851A
Cited
US3930046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |