US2729427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bit
Assignee: EJ Longyear Co
•
Filing: 1952-01-18
•
Granted: 1956-01-03
•
Expires: 1972-01-18
Abstract
No abstract record available.
Inventors
- 👤 Frank F Davis
- 👤 Stewart G Richmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:36
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1676887A
Cited
US1923488A
Cited
US2136359A
Cited
US2371490A
Cited
US2495400A
Cited
US2593229A
Cited
US2662738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |