Patent US2594378A successfully refreshed from Google Patents.
US2594378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow interlocked building block and wall
Assignee: Columbia Protektosite Co Inc
•
Filing: 1947-07-05
•
Granted: 1952-04-29
•
Expires: 1967-07-05
Abstract
No abstract record available.
Inventors
- 👤 Nicholas T Baldanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:03
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/42; E04B2002/0295
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US959846A
Cited
US1365705A
Cited
CH81405A
Cited
FR544492A
Cited
US1732056A
Cited
US1970414A
Cited
US2176213A
Cited
US2173213A
Cited
US2141000A
Cited
US2181814A
Cited
US2338870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |