US3957067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable dental floss
Assignee: Individual
•
Filing: 1975-04-16
•
Granted: 1976-05-18
•
Expires: 1995-04-16
Abstract
Abstract A durable dental floss comprised of aromatic polyamide fibers having at least 85 percent of the amide linkages attached directly to two aromatic rings. The floss is heat stable, hydrophobic and has a high tenacity.
Inventors
- 👤 Kenneth N. Ferraro
- 👤 Betty Nell Ferraro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:24
CPC Classifications
A; A61; A61C; A61C15/00; A61C15/04; A61C15/041
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
8 words
A dental floss consisting essentially of an aramid.
Claim 2
Dependent Claim
8 words
A dental floss consisting essentially of an aramid.
Claim 3
Dependent Claim
21 words
A dental floss as in claim 1 wherein said floss has a tenacity of approximately 20 to 24 grams per denier.
Claim 4
Dependent Claim
22 words
A dental floss as in claim 1 wherein said aramid is comprised of the condensation polymer of terephthalic acid and a diamine.
Claim 5
Dependent Claim
13 words
The dental floss of claim 3 wherein said diamine is an aromatic diamine.
Claim 6
Dependent Claim
32 words
A dental floss consisting essentially of an aramid comprising the condensation polymer of terephthalic acid and an aromatic diamine, said floss having a tenacity of approximately 20 to 24 grams per denier.
Claim 7
Dependent Claim
32 words
A dental floss consisting essentially of an aramid comprising the condensation polymer of terephthalic acid and an aromatic diamine, said floss having a tenacity of approximately 20 to 24 grams per denier.
Claim 8
Dependent Claim
18 words
The dental floss of claim 5 wherein said floss is provided with five heat set twists per inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |