US2113253A
Expired / Lapsed
US
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Therapeutic apparatus
Assignee: AT&T Inc
•
Filing: 1935-12-24
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Granted: 1938-04-05
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Expires: 1955-12-24
Abstract
No abstract record available.
Inventors
- 👤 Alvin N Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H2205/00; A61H2205/10; A61H9/0071; Y; Y10; Y10S; Y10S128/00; Y10S128/20
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) | 1941-04-04 | 1941-10-04 | 1942-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-04-04 | 1945-10-04 | 1946-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-04-04 | 1949-10-04 | 1950-04-05 | $7700.00 | Window Closed / Lapsed |