Patent US2961803A successfully refreshed from Google Patents.
US2961803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contraction joint and seal for concrete structures
Assignee: Individual
•
Filing: 1957-03-21
•
Granted: 1960-11-29
•
Expires: 1977-03-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Shapiro
- 👤 Shapiro Morris
- 👤 Shapiro Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:57
CPC Classifications
E; E04; E04F; E04F15/00; E04F15/12; E04F15/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1318405A
Cited
US676785A
Cited
US639961A
Cited
US1100531A
Cited
US1530105A
Cited
US2192570A
Cited
US2103337A
Cited
US2254769A
Cited
US2282829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |