US2632235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming valve guides
Assignee: Caterpillar Inc
•
Filing: 1947-09-20
•
Granted: 1953-03-24
•
Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 William L H Doyle
- 👤 Glen C Riegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:57
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49668; Y10T29/49707
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US652845A
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US935659A
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US1272051A
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US1158369A
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US1347490A
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US1714660A
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US1845122A
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US1826148A
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US1909553A
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US2055341A
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US2145864A
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US2175705A
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US2368007A
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US2398364A
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US2363050A
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US2383727A
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US2423868A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |