US1823535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Therapeutic lamp
Assignee: Individual
•
Filing: 1928-10-29
•
Granted: 1931-09-15
•
Expires: 1948-10-29
Abstract
No abstract record available.
Inventors
- 👤 Frutkow Nathaniel
- 👤 Antonius J Viken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
F; F21; F21V; F21V29/00; F21V29/50; F21V29/502; F21V29/503; F21V29/60; F21V29/67; F21V29/673; F21W; F21W2131/00; F21W2131/20; F21W2131/205
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) | 1934-09-14 | 1935-03-16 | 1935-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-14 | 1939-03-16 | 1939-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-14 | 1943-03-16 | 1943-09-15 | $7700.00 | Window Closed / Lapsed |