US1408931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamo-electric machine
Assignee: RICHARD JOHN HAWKES RYALL
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Filing: 1918-11-21
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Granted: 1922-03-07
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Expires: 1938-11-21
Abstract
No abstract record available.
Inventors
- 👤 Cooper Thomas Lancelot Reed
- 👤 Todman James Claud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:57
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/18; H02K1/185
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) | 1925-03-06 | 1925-09-05 | 1926-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-03-06 | 1929-09-05 | 1930-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-03-06 | 1933-09-05 | 1934-03-07 | $7700.00 | Window Closed / Lapsed |