US2720105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation shield block
Assignee: Individual
•
Filing: 1950-08-02
•
Granted: 1955-10-11
•
Expires: 1970-08-02
Abstract
No abstract record available.
Inventors
- 👤 James O Billups
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:24
CPC Classifications
G; G21; G21F; G21F3/00; G21F3/04; E; E04; E04B; E04B2/00; E04B2/02; E04B2/04; E04B2/06; E04B2/08; E04B2002/0202; E04B2002/0204; E04B2002/0206; E04B2002/0232
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US877996A
Cited
GB191512509A
Cited
CH84402A
Cited
GB137978A
Cited
US1652743A
Cited
CH200583A
Cited
US2290369A
Cited
GB579690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |