US3442991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing aeroconcrete building blocks
Assignee: Individual
•
Filing: 1967-05-24
•
Granted: 1969-05-06
•
Expires: 1987-05-24
Abstract
No abstract record available.
Inventors
- 👤 Walter Lanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:52
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/50; B28B1/503; E; E04; E04B; E04B2/00; E04B2/02; E04B2/28; E04B2/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR376787A
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FR1060135A
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FR1088187A
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FR1135584A
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US3217069A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |