Patent US2221309A successfully refreshed from Google Patents.
US2221309A
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Insulating element
Assignee: INSULFOIL Corp OF AMERICA
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Filing: 1936-02-10
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Granted: 1940-11-12
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Expires: 1956-02-10
Abstract
No abstract record available.
Inventors
- 👤 Michel S Gazelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/06; F16L59/07; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/7654; F17; F17C; F17C13/00; F17C13/001; Y; Y10; Y10S; Y10S229/00; Y10S229/939; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727; Y10T428/31504; Y10T428/31678; Y10T428/31703
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-11-12 | 1944-05-13 | 1944-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-12 | 1948-05-13 | 1948-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-12 | 1952-05-13 | 1952-11-12 | $7700.00 | Window Closed / Lapsed |