Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
WC

Walter P. Cullen — 41 Patents

Pfizer: 41 patents #29 of 5,153Top 1%
East Lyme, CT: #2 of 183 inventorsTop 2%
Connecticut: #676 of 34,797 inventorsTop 2%
Overall (All Time): #75,001 of 4,157,543Top 2%
41 Patents All Time
Walter P. Cullen has been granted 41 US patents while listed as an inventor at Pfizer. The first was granted in 1980 and the most recent in October 1999. Walter P. Cullen ranks #75,001 of 4,157,543 US inventors in our database (top 1.8%). Patent records list Walter P. Cullen in East Lyme, CT, US.

Patents per Year

Patents granted per year, 1980 to 1999Bar chart with a peak of 5 patents in 1985.peak 51980: 3 patents19801981: 2 patents1982: 1 patents19821983: 1 patents1984: 3 patents19841985: 5 patents1986: 3 patents19861987: 2 patents1988: 2 patents19881989: 1 patents1990: 3 patents19901991: 2 patents1992: 4 patents19921993: 1 patents1994: 1 patents19941995: 3 patents1996: 2 patents19961999: 2 patents1999

Issued Patents All Time

Showing 1–25 of 41 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5965445 Polycyclic ether antibiotic having anthelmintic, anticoccidial and growth promotant activity John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1999-10-12 $270,323,000
5891727 Acidic polycyclic ether useful as an anticoccidial agent and as a growth promotant John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1999-04-06 $325,960,000
5494820 Streptomyces braegensis strain and its cultivation in a process for producing C.sub.9 -desoxo-FK-520 Mark A. Guadliana, Liang H. Huang, Keiji Kaneda, Nakao Kojima, Gloria J. Kostek +3 more 1996-02-27 $126,534,000
5494931 Acidic polycyclic ether antibiotic John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1996-02-27 $126,534,000
5478735 Process for producing acidic polycyclic ether antibiotic having anticoccidial and growth promant activity with Actinomadura John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1995-12-26 $111,754,000
5418152 Acidic polycyclic ether antibiotic John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1995-05-23 $25,981,000
5403738 Microorganism for producing polycyclic ether antibiotics John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1995-04-04 $30,649,000
5298524 Acidic polycyclic ether antibiotic having an anticoccidial and growth promotant activity John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1994-03-29 $28,033,000
5206263 Acidic polycyclic ether useful as an anticoccidial agent and as a growth promotant John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1993-04-27 $36,646,000
5158937 Acidic polycyclic ether antibiotic having anticoccidial and growth promotant activity John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1992-10-27 $45,102,000
5155097 Polycyclic ether antibiotic having anthelmintic, anticoccidial and growth promotant activity John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1992-10-13 $70,100,000
5147858 Acidic polycyclic ether useful as an anticoccidial agent and as a growth promotant John P. Dirlam, Hiroshi Maeda, Junsuke Tone 1992-09-15 $20,734,000
5100785 Polycyclic ether antibiotic Hiroshi Maeda, John C. Ruddock, Junsuke Tone 1992-03-31 $44,458,000
5064855 Acid polycyclic ether antibiotic James R. Hauske, Gloria J. Kostek, Hiroshi Maeda, Junsuke Tone 1991-11-12 $19,722,000
4992423 Polycyclic ether antibiotics Hiroshi Maeda, John C. Ruddock, Junsuke Tone 1991-02-12 $10,228,000
4956283 Process for preparing macrolide antibiotics by culturing streptomyces hirsutus ATCC 53513 James R. Hauske, Hiroshi Maeda, Junsuke Tone 1990-09-11 $16,149,000
4920050 Acidic polycyclic ether antibiotic James R. Hauske, Gloria J. Kostek, Hiroshi Maeda, Junsuke Tone 1990-04-24 $10,191,000
4908316 Streptomyces sp. N664-30 which produces an ionophore antibacterial agent John R. Oscarson, Junsuke Tone, Hiroshi Maeda 1990-03-13 $23,111,000
4835141 Neutral macrolide antibiotics from Streptomyces James R. Hauske, Hiroshi Maeda, Junsuke Tone 1989-05-30 $5,461,000
4751317 Inophore antibacterial agent from streptomyces John R. Oscarson, Junsuke Tone, Hiroshi Maeda 1988-06-14 $18,782,000
4746650 Polycyclic ether antibiotic Hiroshi Maeda, John C. Ruddock, Junsuke Tone 1988-05-24 $57,326,000
4707493 19-epi-dianemycin as an anticoccidial and antibacterial agent Walter D. Celmer, Hiroshi Maeda, John C. Ruddock, Junsuke Tone 1987-11-17 $22,135,000
4652523 Method of preparing a new polyether antibiotic from streptomyces Walter D. Celmer, Hiroshi Maeda, Junsuke Tone 1987-03-24 $28,763,000
4625041 Acidic polycyclic ether antibiotic Walter D. Celmer, Hiroshi Maeda, Junsuke Tone 1986-11-25 $16,616,000
4605624 Nocardia species capable of producing nargenicin C.sub.1 Walter D. Celmer, Riichiro Shibakawa, Junsuke Tone 1986-08-12 $57,723,000