US3247633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement building block construction and wall made of the same
Assignee: PATENT BLOCK CORP
•
Filing: 1964-07-06
•
Granted: 1966-04-26
•
Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Russell F Schultz
- 👤 Stella M Dronko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:04
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/14; E04B2/16; E04B2002/0202; E04B2002/0204
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US767494A
Cited
US1334599A
Cited
GB375042A
Cited
US2459028A
Cited
US2539868A
Cited
US2708358A
Cited
US2810285A
Cited
US3099900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |