Patent US2638577A successfully refreshed from Google Patents.
US2638577A
Expired / Lapsed
US
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Transducer
Assignee: Harris Transducer Corp
•
Filing: 1949-11-15
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Granted: 1953-05-12
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Expires: 1969-11-15
Abstract
No abstract record available.
Inventors
- 👤 Harris Wilbur Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:36
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; B06B1/06; B06B1/0644; B06B1/0655
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076330A
Cited
US2005741A
Cited
US2116522A
Cited
US2438925A
Cited
US2497901A
Cited
US2480535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |