US2852934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated hollow building blocks
Assignee: THERMOFLECTOR Corp
•
Filing: 1952-08-08
•
Granted: 1958-09-23
•
Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Earl R Amundson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/14; E04B2002/0256; E04B2002/0289
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2055184A
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US960554A
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US1625628A
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US1623094A
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US1706647A
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US1884319A
Cited
GB410365A
Cited
US2332287A
Cited
US2251585A
Cited
US2295216A
Cited
GB546540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |