US3442274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treating apparatus
Assignee: Multifastener Corp
•
Filing: 1967-11-28
•
Granted: 1969-05-06
•
Expires: 1987-11-28
Abstract
No abstract record available.
Inventors
- 👤 William R Keough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:45
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/63; C21D1/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1517689A
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US2063784A
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GB569531A
Cited
US2494361A
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US2638909A
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US2724394A
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US3146782A
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US3103936A
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US3340109A
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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) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |