Patent US1327269A successfully refreshed from Google Patents.
US1327269A
Expired / Lapsed
US
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Apparatus for use in sealing crevices in rock formations
Assignee: Individual
•
Filing: 1919-06-09
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Granted: 1920-01-06
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Expires: 1939-06-09
Abstract
No abstract record available.
Inventors
- 👤 George W Christians
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:25
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/10; E21D1/16; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; E21B43/00; E21B43/16; E21B43/24; E21B43/2401
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1923-01-05 | 1923-07-07 | 1924-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-01-05 | 1927-07-07 | 1928-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-01-05 | 1931-07-07 | 1932-01-06 | $7700.00 | Window Closed / Lapsed |