US3492704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making concrete blocks
Assignee: Individual
•
Filing: 1967-06-15
•
Granted: 1970-02-03
•
Expires: 1987-06-15
Abstract
No abstract record available.
Inventors
- 👤 Donald D Schwellenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:31
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/24; B28B11/245; B65; B65G; B65G1/00; B65G1/02; B65G1/04; B65G1/0407; Y; Y10; Y10S; Y10S264/00; Y10S264/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3272307A
Cited
US644520A
Cited
US959996A
Cited
US2459524A
Cited
US2502940A
Cited
US3323662A
Cited
US3268098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |