Patent US2844637A successfully refreshed from Google Patents.
US2844637A
Expired / Lapsed
US
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Gastight instrument shell for furnaces
Assignee: Individual
•
Filing: 1953-08-31
•
Granted: 1958-07-22
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Alfred Charles Edouard Borel
- 👤 Jean Pierre Borel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:50
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/08; G01K1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US578333A
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DE330726C
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GB190807910A
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US1489116A
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US1615451A
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US1773826A
Cited
US1994983A
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US2027961A
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US2177046A
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US2405075A
Cited
US2664373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |