US1660924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material
Assignee: Individual
•
Filing: 1923-11-03
•
Granted: 1928-02-28
•
Expires: 1943-11-03
Abstract
No abstract record available.
Inventors
- 👤 Hopkinson Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:54
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/04; D06N3/10; D06N2205/00; D06N2205/20; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/249933; Y10T428/249934
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) | 1931-02-27 | 1931-08-29 | 1932-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-02-27 | 1935-08-29 | 1936-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-02-27 | 1939-08-29 | 1940-02-28 | $7700.00 | Window Closed / Lapsed |