US2851577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater assembly
Assignee: Edwin L Wiegand Co
•
Filing: 1957-03-21
•
Granted: 1958-09-09
•
Expires: 1977-03-21
Abstract
No abstract record available.
Inventors
- 👤 Elden E Bolds
- 👤 William J Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:33
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/18; F24H9/1809; F24H9/1818; Y; Y10; Y10T; Y10T24/00; Y10T24/14; Y10T24/1412; Y10T24/1441
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1936391A
Cited
US2029075A
Cited
US2367369A
Cited
US2469801A
Cited
US2703358A
Cited
US2742561A
Cited
US2725457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |