US2711022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perspective demonstrator
Assignee: Individual
•
Filing: 1952-10-07
•
Granted: 1955-06-21
•
Expires: 1972-10-07
Abstract
No abstract record available.
Inventors
- 👤 Everett L Salfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:32
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/147
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL19736C
Cited
US190797A
Cited
US366987A
Cited
US1059893A
Cited
US1223539A
Cited
US1746331A
Cited
US2000766A
Cited
US2419610A
Cited
GB655228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |