Patent US2456807A successfully refreshed from Google Patents.
US2456807A
Expired / Lapsed
US
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Antifreeze drain fitting
Assignee: Vapor Heating Corp
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Filing: 1946-08-09
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Granted: 1948-12-21
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Expires: 1966-08-09
Abstract
No abstract record available.
Inventors
- 👤 John J Yindrock
- 👤 John Van Vulpen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
B; B61; B61D; B61D35/00; F; F16; F16B; F16B7/00; F16B7/04; F16B7/044; F16B7/048; F16B7/0493; F16L; F16L53/00; F16L53/30; F16L53/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US788786A
Cited
US2021082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |