US3310177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with pleat spacing means
Assignee: Stone Filter Co Inc
•
Filing: 1964-06-02
•
Granted: 1967-03-21
•
Expires: 1984-06-02
Abstract
No abstract record available.
Inventors
- 👤 Southwick W Briggs
- 👤 William A Brazerol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:14
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A FILTER COMPRISING A PERFORATED CENTER TUBE, A PERMEABLE PAPER FILTER MEDIUM HAVING AXIAL PLEATS DEFINING INNER AND OUTER FOLDS, SAID INNER FOLDS ENGAGING SAID CENTER TUBE, A PERFORATED COVER MEMBER SURROUNDING SAID MEDIUM, AND A PLEATED SPACER INTERPOSED BETWEEN SAID COVER MEMBER AND OUTER FOLDS MAINTAINING SAID OUTER FOLDS IN SPACED RELATIONSHIP, SAID PLEATED SPACER HAVING AN INNER FOLD EXTENDING FREELY BETWEEN EACH PAIR OF ADJACENT PLEATS OF SAID MEDIUM AND OUTER FOLDS ADHESIVELY BONDED TO SAID COVER MEMBER.
Claim 2
Dependent Claim
80 words
A FILTER COMPRISING A PERFORATED CENTER TUBE, A PERMEABLE PAPER FILTER MEDIUM HAVING AXIAL PLEATS DEFINING INNER AND OUTER FOLDS, SAID INNER FOLDS ENGAGING SAID CENTER TUBE, A PERFORATED COVER MEMBER SURROUNDING SAID MEDIUM, AND A PLEATED SPACER INTERPOSED BETWEEN SAID COVER MEMBER AND OUTER FOLDS MAINTAINING SAID OUTER FOLDS IN SPACED RELATIONSHIP, SAID PLEATED SPACER HAVING AN INNER FOLD EXTENDING FREELY BETWEEN EACH PAIR OF ADJACENT PLEATS OF SAID MEDIUM AND OUTER FOLDS ADHESIVELY BONDED TO SAID COVER MEMBER.
References Cited (Backward Citations)
FR1059010A
Cited
US2675127A
Cited
FR1130459A
Cited
GB823648A
Cited
US2988227A
Cited
DE1118758B
Cited
US3241680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |