Patent US2717668A successfully refreshed from Google Patents.
US2717668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building construction
Assignee: IND RES LAB
•
Filing: 1950-06-03
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Granted: 1955-09-13
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Expires: 1970-06-03
Abstract
No abstract record available.
Inventors
- 👤 William G Johnson
- 👤 Robert J Castleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:07
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US531999A
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US1305492A
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US940378A
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US950832A
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US1975842A
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US1885330A
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US1889091A
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US2109655A
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US2114155A
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US2108682A
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US2264961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |