US2860489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grouting or sealing apparatus
Assignee: Individual
•
Filing: 1953-09-18
•
Granted: 1958-11-18
•
Expires: 1973-09-18
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E02; E02D; E02D3/00; E02D3/12; E04; E04G; E04G23/00; E04G23/02; E04G23/0203; E04G23/0211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662336A
Cited
US1850218A
Cited
US1956694A
Cited
US2313109A
Cited
US2671512A
Cited
US2715444A
Cited
US2694453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |