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US2477571A
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Assignee: Individual
•
Filing: 1948-05-21
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Granted: 1949-08-02
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Expires: 1968-05-21
Abstract
No abstract record available.
Inventors
- 👤 Richard M Billman
- 👤 Harold F Hotchkiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:49
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE368898C
Cited
US1949856A
Cited
US1496194A
Cited
US1443786A
Cited
US1451044A
Cited
US1919693A
Cited
US2363711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |