Patent US3031827A successfully refreshed from Google Patents.
US3031827A
Expired / Lapsed
US
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Filter and method of making the same
Assignee: Research Products Corp
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Filing: 1956-12-26
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Granted: 1962-05-01
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Ragnar E Onstad
- 👤 Milton J Shoemaker
- 👤 Stanley H Frohmader
- 👤 Carl B Rowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:37
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/04; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/03; B01D29/11; B01D29/111; B01D29/31; B01D29/33; B01D39/00; B01D39/10; B01D39/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12347; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24802; Y10T428/24826; Y10T428/24917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A FILTER COMPRISING A PLURALITY OF LAYERS OF EXPANDED METAL FOIL ARRANGED IN CLOSE ORDER WITH THE STRUCTURAL ELEMENTS OF THE SEVERAL LAYERS ENGAGING THE STRUCTURAL ELEMENTS OF ADJACENT LAYERS AT A MULTIPLICITY OF POINTS THROUGHOUT SAID FILTER, THE ENGAGING ELEMENTS BEING BONDED TOGETHER AT AT LEAST A SUBSTANTIAL PROPORTION OF SAID MULTIPLICITY OF POINTS BY A BONDING AGENT WHEREBY TO HOLD ALL OF SAID LAYERS OF THE FILTER TOGETHER.
Claim 2
Dependent Claim
70 words
A FILTER COMPRISING A PLURALITY OF LAYERS OF EXPANDED METAL FOIL ARRANGED IN CLOSE ORDER WITH THE STRUCTURAL ELEMENTS OF THE SEVERAL LAYERS ENGAGING THE STRUCTURAL ELEMENTS OF ADJACENT LAYERS AT A MULTIPLICITY OF POINTS THROUGHOUT SAID FILTER, THE ENGAGING ELEMENTS BEING BONDED TOGETHER AT AT LEAST A SUBSTANTIAL PROPORTION OF SAID MULTIPLICITY OF POINTS BY A BONDING AGENT WHEREBY TO HOLD ALL OF SAID LAYERS OF THE FILTER TOGETHER.
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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) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |